Nick Cannon Heartbreak — Friend Killed By San Diego Psycho

Nick Cannon went public over the heartbreaking loss of a childhood friend — slaughtered by a psycho in the San Diego poolside slayings!

Nick Cannon went public over the heartbreaking loss of a childhood friend — slaughtered by a psycho in the San Diego poolside slayings!

Monique Clark — a longtime pal who Nick mourned as "more like family" — was the sole fatality after 49-year-old Peter Selis went out to a pool at a San Diego apartment complex and opened fire on innocent revelers at a birthday party. Monique and one other person was shot as Selis talked on his phone to an ex-girlfriend!

"My heart hurts with great sadness tonight," wrote the former "America's Got Talent" host about Monique, adding: "Such a beautiful spirit with an infectious smile. I have nothing but wonderful memories of this Angel. Tears can't express the pain and shock. A mother of 3, a sister, a daughter, a cousin, a friend and a Queen... Rest in Paradise."

"My heart hurts with great sadness tonight," wrote the former "America's Got Talent" host about Monique, adding: "Such a beautiful spirit with an infectious smile. I have nothing but wonderful memories of this Angel. Tears can't express the pain and shock. A mother of 3, a sister, a daughter, a cousin, a friend and a Queen... Rest in Paradise."

Three police officers rushed to the scene as the gunshots rang out, and Selis (pictured) was shot down after he pointed his firearm at the cops. "He was very docile in his facial expression," said Demetrius Griffin, who was attending the party. "No smiling, laughing, talking. He let off eight rounds, reloaded, let off another eight, reloaded again."