Summary based on the NamUs case record (MP60131)
On February 18, 2018, Mark John Derosia, a 32-year-old white male, was last seen in Watertown, New York, under circumstances that have left unanswered questions about his whereabouts. Mark had been spending time with a friend who arranged for a taxi to transport him to a local hospital. However, according to information later obtained by law enforcement from the taxi company, Mark changed his destination after being picked up.
Rather than continuing to the hospital, he instructed the driver to take him to West Main Street in Watertown, specifically requesting to be dropped off near the intersection of West Main Street and Court Street. This location became the last documented point in his movements. After leaving the taxi, Mark reportedly had no further contact with anyone known to investigators. The reason he originally needed transportation to the hospital has not been publicly explained, nor has it been established why he decided to change his destination. What initially appeared to be a routine taxi ride became the final known event preceding his disappearance.
Mark was officially reported missing to the Watertown Police Department on February 22, 2018, four days after his last reported contact. Investigators worked to reconstruct his movements and contacted the taxi company to determine whether he had been picked up and where he had been taken. Company records reportedly confirmed that Mark had been transported to the intersection of West Main Street and Court Street rather than the hospital. Although this information established an important point in the timeline, it did not explain what happened afterward. Authorities were unable to determine whether Mark remained in Watertown, continued traveling on foot, or obtained transportation to another location. At one point during the investigation, there was speculation that he might have traveled to Florida. Investigators pursued this possibility by checking with local agencies in Florida, but those inquiries failed to produce any confirmed information about his whereabouts. The potential connection to Florida remained unsubstantiated, leaving investigators without a verified lead explaining where Mark had gone after the taxi dropped him off.
At the time of his disappearance, Mark stood approximately 5 feet 10 inches tall and weighed around 180 pounds. He had blue eyes and thick brown hair that was described as sometimes long and generally unkempt. He had also worn a mustache and beard in the past, meaning his facial appearance could vary depending on whether he had facial hair. One of his documented distinguishing characteristics was a tattoo depicting Jesus on his left shoulder. Additional information provided about Mark indicates that he has numerous tattoos across his body, including his name, "Mark John," tattooed on his legs. This additional tattoo information has not been independently verified through publicly available records, but it could be particularly valuable in identifying him. Tattoos can remain recognizable even when a person's hairstyle, weight, or overall appearance changes considerably over time. The combination of his distinctive body art, physical characteristics, and known appearance could provide important identifying details for anyone who may have encountered him after February 2018. Publicly available information does not establish what clothing Mark was wearing when he disappeared or whether he had identification, money, a telephone, or other personal belongings in his possession.
Mark's disappearance was entered into the National Missing and Unidentified Persons System under case number MP60131, with the Watertown Police Department serving as the investigating agency under case number CA-00622-18. Despite the information obtained from the taxi company and inquiries into the possibility that he traveled to Florida, the publicly documented investigation has not established what happened to him after his final reported taxi ride. No confirmed subsequent sighting or independently verified account of his movements has been identified in the available reports. There has also been no publicly established evidence identifying a suspect or confirming that criminal activity was responsible for his disappearance. The uncertainty surrounding the case has persisted for years, with the intersection of West Main Street and Court Street remaining the last documented location associated with his whereabouts. What happened after he stepped out of the taxi remains the central mystery. Whether Mark intended to visit someone, travel elsewhere, or simply spend time in another part of Watertown has never been publicly established. His disappearance illustrates how a seemingly ordinary change in plans can leave behind years of unanswered questions. The case of Mark John Derosia remains centered on a missing man whose last known movements were traced to a specific intersection in Watertown on February 18, 2018, with no confirmed explanation of where he went afterward. His identifying characteristics, particularly his numerous tattoos and the name "Mark John" reportedly tattooed on his legs, may prove important in recognizing him and helping provide answers about his disappearance.Last Seen: Feb 18, 2018
