Suspect arrested in homicide of 19-year-old Navy sailor in West Allis
Castanon was fatally shot near 84th and Becher on May 8 after confronting a man who was reportedly harassing a female friend.
WAPD detectives and SWAT personnel arrested a 36-year-old suspect from Milwaukee on Wednesday, July 20.
Police say charges will be referred to the Milwaukee District Attorney's Office in the coming days.
Castanon was a Navy sailor stationed in Great Lakes, Illinois. He was at the end of his training to become a Gunner's Mate.