Rocktober Blood

Rocktober Blood is a 1984 metalsploitation horror film, directed by Beverly Sebastian. It stars Tray Loren, Donna Scoggins and Cana Cockrell.

Meanwhile Billy returns to the studio, where he finds only Kevin and Mary Mary Well, Kevins assistant. In an enigmatic move, Billy kills Kevin by slitting his throat and impales Mary on a wallmounted coat peg. When Lynn returns, she finds Billy smoking some drugs at the recording studios control panel. Lynn is unaware that Billy has just killed both Kevin and Mary while she was gone. Once Lynn finds out, she is saved by some security guards.After a brief intermission, it is two years later, where it is revealed that Billy was captured, tried and executed. It is now the Rocktober Blood Tour Press Party, and Lynn and the remaining band members are touring as Headmistress. A VJ who interviews Lynn, asks several questions about the bands tour, as well as Billys fall from grace, to which Lynn responds by stating that identifying Billy was the hardest thing she ever had to do. A mysterious figure then appears in a Halloween death mask, and tells Lynn to meet with Chris Nigel Benjamin, the bands manager, in the office. When she arrives in the office, she is cornered by Billy, in the same death mask, who leaves her curled up, and crying on the floor. After that, Billy persistently stalks Lynn, killing people involved with her along the way, but hiding their bodies, to make others think she is crazy by claiming that Billy is after her. ........

Source: Wikipedia