Despite a thorough search of online sources, including obituary records and public information from the Washington, D.C. Metropolitan Police Department, there is no information available regarding the death of a male named William Morrison in Washington, D.C. under circumstances that would involve arrests or suspects.
Searches for homicide victims in Washington, D.C. do not include anyone by that name in the publicly available records of unsolved cases. Similarly, press releases and news archives do not contain information about a homicide investigation where William Morrison was the victim.
While there are obituaries for individuals named William Morrison from the Washington, D.C. area, none of these indicate a violent death or any ongoing police investigation.
Without a verifiable online record of this specific incident, no details can be provided regarding the circumstances of the death, any potential suspects, or arrests made in connection with the case.