NORTH MIAMI BEACH, Fla. -- North Miami Beach police said a lover's quarrel turned violent last week when a former Miami-Dade teacher stabbed his ex-boyfriend to death with a large knife outside the victim's apartment on Northeast 164th Street.

"He said 'call the police, he's killing me.' He said that several times," Warren Sankar said. Sankar told Local 10's Rob Schmitt that the victim, 54-year old Charles Brown, a history teacher at North Miami Senior High, was stabbed to death in the seventh-floor hallway right outside his own apartment last Thursday afternoon.

Police said 53-year-old Gregory Higgs killed Brown, angry after Brown had broken up with him with no explanation earlier this year.

North Miami Beach Police arrested Higgs, on leave from Miami Northwestern Senior High, just moments after the killing, covered in blood across the street.

The seventh-floor hallway has blood stains on the carpet and scuff marks on the walls from the incident.

Gregory Higgs lives in Weston and neighbors described him as "a bit weird." Neighbors reported hearing him screaming at Brown on the phone in recent months.

Higgs is charged with first-degree murder and is being held on no bond.