Kevin Prasad, 31, is accused of murdering his coworker's fiance in a jealous rage on April 25

A man has been arrested for killing the fiancé of a female colleague who he had been trying to convince to go out with him for years.

Kevin Prasad, 31, is accused of murdering Mark Mangaccat on April 25 at his home in San Francisco.

Mangaccat was preparing to move from California to Las Vegas with his long-term girlfriend Thandel Seinn and their three-year-old daughter.

All three of them worked together at San Francisco Airport. Prasad worked for the company Covenant Aviation Security but it is not clear what the couple's jobs were.

On April 25, after Seinn's last shift, her fiance picked her up and drove her home. Prasad followed them in a car that was driven by his friend Donovan Rivera.

As the couple backed into their garage, Prasad allegedly jumped out of the car he was in and ran towards the couple's vehicle with his hood up.

Mark Mangaccat and his fiancee Thandel Seinn were preparing to move to Las Vegas with their three-year-old daughter. After her last day at work, Prasad followed them home and shot him as he backed their car into the garage

He fired several shots before retreating back into his friend's car and fled, according to police.

Prasad's friend Donovan Rivera was his getaway driver, according to police

Seinn was sitting in the passenger seat but was unharmed. It is not known if the couple's child was also in the car at the time.

Mangaccat died of five or six gunshot wounds while sitting in the driver's seat.

Authorities say Prasad believed he would have a chance at winning her over if he was able to get her fiance 'out of the way'.

'It's this bizarre thought process of, "if I get rid of the boyfriend, I can be there to comfort the grieving girlfriend,"' San Mateo County District Attorney Steve Wagstaffe told The Sacramento Bee.

Seinn did not recognize Prasad at the time of the shooting and at first had no clue who had carried it out.

When police began questioning her on who it may have been, she told them about how he had asked her not to leave California but said she thought it was a joke.

Seinn said she never suspected Prasad would turn violent and that she thought he was always joking when he told her not to move away with her fiance and child and to stay with him

Mangaccat was described by friends as a loving father and son. He is pictured with his three-year-old daughter (right). Police say Prasad's (seen left) plan was to comfort his fiancee once he was 'out the way' and hopefully win her over

'We were friends. At the airport we work in same job; [my] boyfriend, me and him, we were friends.

'He just tell me, "Don’t go" and "I want to be with you." He would just say something like a friendly joke,' she told CBS San Francisco.

Prasad and Rivera made their first appearances in court on Monday but neither entered a plea.

They will return before a judge on May 8. Prasad has no criminal history.

