Joe MCMahon was found lying on the street in front of his property in Pasadena in the early hours of Friday (24Jul15), after Los Angeles County sheriff's deputies responded to reports of gunfire. He was just 25.

MCMahon worked as an associate producer on the fishing show for several episodes in 2013.

A statement issued by bosses at Discovery, the U.S. network behind Deadliest Catch, reads: "We are heartsick about this tragedy - our thoughts and prayers go out to his family and to all that knew and worked with him."

Police have yet to establish a motive for the incident, but do not believe drugs were involved.

An investigation into the tragedy is underway.