In the late spring of 2001, a 22-year-old woman named Amy Marie Derewitz vanished from Dearborn Heights, Michigan, under deeply concerning circumstances. The last time she was confirmed to be seen was on June 3, 2001, when she went to the home she had previously shared with her ex-fiancé, David Kniga, to retrieve her mail. This was shortly after she had ended their relationship and moved out. When she arrived, an argument reportedly broke out between her and Kniga. At the time of her disappearance, Amy was described as a dependable person with long, thick, dark blonde to light brown hair, brown eyes, and piercings in her ears and navel. She was last seen wearing a gray t-shirt, reddish-colored boxer shorts, and house slippers.
Amy Marie Derewitz was a 22-year-old woman from Dearborn Heights, Michigan, whose disappearance was officially recorded in some databases as June 16, 2001. The evidence developed during the investigation, however, established that the last known events involving Amy occurred on June 3, 2001, when she went to the home of her former fiancé, David Anthony Kniga, in the 3900 block of Detroit Street near Colgate Street. Amy was approximately five feet four inches tall and weighed between 103 and 108 pounds. She had long blond or light brown hair, brown eyes, pierced ears, and a pierced navel. She was reportedly wearing a gray shirt, reddish-colored boxer shorts, and house slippers. What began as a short visit to collect mail from a house where she had recently lived became the scene of a violent confrontation from which Amy never emerged alive.
Amy had ended her engagement to Kniga in May 2001 and moved out of the Dearborn Heights residence they had shared. Although the relationship was over, some of her mail was apparently still being delivered there, requiring her to return to retrieve it. Kniga's new girlfriend was at the house when Amy arrived on June 3. According to the account the girlfriend later gave authorities, Amy and Kniga argued before Amy left the property. Amy returned a short time later, and another confrontation began, this time involving the new girlfriend. The tense encounter escalated inside the home, placing Amy in the company of two people at the final known location where she was seen.
The new girlfriend told investigators that Kniga grabbed Amy and took her into the basement. Kniga later came back upstairs and ordered his girlfriend to leave. As the girlfriend departed, she reportedly saw Amy lying on the basement floor, gasping for breath and appearing to be severely injured. Despite seeing Amy in obvious distress, she did not call the police, summon an ambulance, or seek medical assistance. She left the residence, and Amy was never seen or heard from again. That observation became the most important eyewitness evidence in the case because it placed Amy critically injured inside Kniga's basement immediately before she disappeared.
Amy's teal green 1994 or 1995 Ford Escort was found abandoned on June 7, four days after the confrontation. It had been left in the parking lot of Ten Eyck Park, approximately two blocks from the home of Amy's mother, and investigators believed it may have been parked there on June 5 or June 6. The location may have been chosen to create the appearance that Amy had visited or attempted to reach her family, but no evidence established that she had driven the car there herself. Investigators found no readable fingerprints inside the vehicle. Amy's purse, identification, and other personal belongings were not recovered from the car, leaving unanswered whether they had been removed to conceal evidence or disposed of elsewhere.
Amy's family immediately rejected the suggestion that she had voluntarily disappeared. She was described as extremely dependable and was not known to leave without warning or abruptly cut off communication with those closest to her. She had worked since high school at Oakwood Commons in Dearborn, where she was employed as a receptionist and server. Amy had also enrolled at Henry Ford Community College and had been considering changing her academic focus from health-related studies to business courses. Her bank accounts and credit cards showed no activity after she vanished, and there was no evidence that she withdrew money, arranged transportation, obtained new housing, or attempted to build a life elsewhere.
Investigators questioned both Kniga and his new girlfriend. The girlfriend cooperated with authorities and underwent a polygraph examination concerning what she had witnessed. Kniga acknowledged that both women had been at his home on June 3, but he claimed that they arrived at different times and denied responsibility for Amy's disappearance. He was scheduled to take a polygraph examination but changed his mind and retained an attorney. For approximately two years, Amy remained officially missing while investigators worked to build a murder case without the recovery of her body.
In June 2003, authorities charged Kniga with second-degree murder in Amy's death. At the time of his arrest, he was still living in the same house where Amy had last been seen injured in the basement. Prosecutors proceeded despite the absence of her remains, relying on the eyewitness account, the circumstances inside the residence, Amy's unexplained disappearance, her abandoned vehicle, and the complete absence of later financial or personal activity. Kniga initially entered a plea of not guilty, but in October 2003 he changed his plea and admitted guilt to the reduced charge of manslaughter.
Kniga said that he placed Amy's body in a dumpster near the former Veterans Affairs hospital in Allen Park, Michigan. By the time he disclosed that location, any refuse from the dumpster had long since been collected and transported away. Searches and investigative efforts failed to recover Amy's remains, and Kniga did not provide information that led authorities to another location. His statement gave the family an account of how Amy may have been removed from the house, but it denied them the opportunity to recover her, arrange a burial, or obtain independent forensic evidence explaining the precise injuries that caused her death.
Because Kniga pleaded guilty to manslaughter rather than being convicted of second-degree murder, he avoided the possibility of a life sentence. He received a prison term of five to fifteen years. He was later paroled in 2015 and discharged from parole in 2017. The legal case established responsibility for Amy's death, but the comparatively limited sentence and the continued absence of her body left her loved ones without the full measure of closure they had sought. The person responsible had admitted causing her death and disposing of her, yet Amy herself remained missing.
The official date attached to Amy's missing-person record has created some confusion. Certain databases list June 16, 2001, while detailed investigative accounts identify June 3 as the day she went to Kniga's home, argued with him, and was seen gravely injured in the basement. The June 3 date is therefore the final known date supported by the witness testimony and the later prosecution. Regardless of the administrative discrepancy, Amy's case is not a mystery involving a woman who simply vanished without known circumstances. It is a homicide in which a witness saw her injured, her former fiancé admitted responsibility, and a court accepted his guilty plea, although her remains were never recovered.
Amy Derewitz's case is ultimately the story of a young woman attempting to move forward after ending a relationship, only to be killed when she returned to her former home for something as ordinary as collecting mail. She was seen lying injured on a basement floor, her vehicle was later abandoned near her mother's home, and her personal possessions and body disappeared. David Kniga was charged with murder, pleaded guilty to manslaughter, and said he discarded Amy in a dumpster near an Allen Park hospital, but no search ever brought her home. In overview, Amy's disappearance became a proven no-body homicide involving a 22-year-old woman, an eyewitness to her final suffering, a former fiancé who accepted criminal responsibility, and a family left with the painful certainty that she was killed but without the dignity of recovering her remains or laying her to rest.
Last Seen: Jun 16, 2001
