A Florida sheriff says a chance encounter with a former Marine beset by delusions of child sex trafficking ultimately led to the massacre of four members of a Florida family including mother holding a baby boy.

Florida investigators say they may never know why a Marine veteran killed a Lakeland family of four.

A former Marine sharpshooter accused of invading the home of apparent strangers in Florida and fatally shooting a woman, her 3-month-old baby and two others was ordered held without bail.

A Florida sheriff says a man wearing full body armor fatally shot four people, including a mother and the 3-month-old baby she was cradling, and engaged in a massive gunfight with police and deputies before getting wounded and surrendering.