[4] He is working on a tribute album to Death founder Chuck Schuldiner who died from pneumonia, caused by complications of his treatment for a brain tumor.

He has also performed as a touring guitarist for Agent Steel in Europe and the UK in 1987, and was briefly in Hallows Eve in 1989.

In addition to playing guitar, Murphy operates a recording studio, SafeHouse Production, where he has mixed and produced albums for other bands.

During his years with Testament he played modified Fender Stratocasters with Floyd Rose bridges and Ibanez guitars, primarily the S series models, as well as B.C.

He is a longtime endorsee of EMG pickups, and mainly uses the 85 and 89 models, although on Testament's The Gathering his Ibanez were fitted with Dimarzio Steve's Special and Air Norton.