Law enforcement and medical assistance arriving at the scene of the Orlando attack. A former classmate of Omar Mateen’s said the shooter was homosexual. Photo: Wikipedia.

Omar Mateen lived a double life.

The homophobic maniac who murdered 49 people inside Orlando’s gay-friendly nightclub Pulse Sunday morning had been hanging out there for three years — and chatted with men via online dating services like Grindr, said multiple witnesses who claimed to have firsthand knowledge of Mateen’s habits.

Read full story at New York Daily News.