The man who was fatally struck on Friday by a departing Frontier Airlines flight on the runway of Denver international airport died by suicide, the city’s medical examiner said on Tuesday at a news conference. On Friday evening, the man, identified as 41-year-old Michael Mott, jumped an 8ft fence with barbed wire on to the runway, according to Phillip Washington, the airport’s chief executive. Roughly two minutes lapsed between Mott’s breach of the runway and when he was hit by the Frontier aircraft. Mott was not an airport employee. He had previous contact with metropolitan-area law enforcement, said Ron Thomas, the Denver police chief. It’s unclear what the contact entailed. The determination of Mott’s manner of death was based on an investigation and scene findings, said Sterling McLaren, a medical examiner. Mott suffered “multiple blunt and sharp force injuries”. Friday’s deadly collision has raised questions about the airport’s security.…