Walter Vicente, 49, and his 24-year-old son Andrew were found shot to death in Vicente’s Norwalk home on Gettysburg Drive on July 14, 2015. The Los Angeles County Sheriff’s Department says Walter was discovered in the living room and Andrew in a bedroom; both were pronounced dead at the scene. No weapons were recovered, there were no signs of forced entry or robbery, and the family’s pit bull was unharmed. Autopsies were pending at the time and no exact time of death had been determined.

Walter was a U.S. Army veteran who ran Walter’s Plumbing and worked alongside Andrew. Neighbors described them as well-liked in a blue-collar, middle-class neighborhood, and investigators report no known disputes or enemies. A combined $20,000 reward was later offered for information leading to arrest and conviction, but the case remained unsolved and the investigation was at a standstill.

If anyone has information about what happened to Walter and Andrew Vicente, please contact the Los Angeles County Sheriff’s Department.