Essie Mae Horne locked eyes with a killer. Standing just inside the frame of her front door in the middle of the night, he opened fire. She dove into her bedroom for cover.

When Horne soon emerged, the young gunman was gone, and her husband — who she had just kissed moments earlier — was dying on the kitchen floor of their Lincoln Park apartment.

Tuesday marked 19 years since Andre Mahan, 31, was gunned down in 2006. It’s been 19 years of questions for her and their two children, the youngest of whom was about 18 months old when his father died. “Why would someone come to my home and do what they did?” Horne said.

Authorities are hoping to solve the mystery. San Diego County Crime Stoppers, which teams with local law enforcement, issued a plea for tips and is offering a reward of up to

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