DETROIT -- The 24-year-old son of the founder of Powerhouse Gyms is wanted for murder.  According to a Detroit police warrant, Peter Dabish is wanted on charges of first-degree murder and torture in the March 11th beating death of 23-year-old Diana Demayo.  Dabish, whose late father Norman is the co-founder of the Powerhouse Gym chain of fitness centers, allegedly killed Dabish with blunt force to the head in a downtown Detroit apartment.  Anyone with information on Dabish's whereabouts is asked to contact Detroit Police.