MANASSAS, Va. — A toddler’s death during a visit with his father last month in Virginia is prompting police to more closely investigate the suicide of the man’s mother and the shooting death of a onetime girlfriend in the past decade.

Fifteen-month-old Prince McLeod Rams died during a three-hour, unsupervised visit with his father, Joaquin S. Rams of Manassas, police said. Manassas Police spokesman Lowell Nevill said that led police to further investigate the 2008 suicide of Joaquin Rams’s mother and the 2003 shooting death of his ex-girlfriend, Shawn K. Mason.