Knoxville police have charged 44-year-old Steven Simpson with first-degree murder in the stabbing death of 50-year-old William Innes in their Sevier Avenue apartment, in South Knoxville. A third, unidentified roommate found Innes dead Friday afternoon. Investigators believe Simpson’s motive was robbery, in support of his drug habit. Innes was stabbed multiple times. Police believe he left the murder scene with the bloodied knife and clothing. Simpson is jailed on $150,000 bond.