ROCKFORD (WIFR) -- Adam Knoll is wanted on a probation violation. Knoll's 33. he's 6'0" tall, 218 lbs., with brown hair and blue eyes. Kenneth Simpson is wanted for failing to register as a sex offender. Simpson is 51 years old. He's 6'0", 150 lbs, with a shaved head and brown eyes. Terry Alexander is wanted on a narcotics violation. He's 26, 5'4", 145 lbs., with a shaved head and brown eyes. And Michael McQueeny is wanted for burglary. McQueeny's 42. He's 5'11", 150 lbs., with gray hair and brown eyes. If you know the wherabouts of any of these four, make the anonymous call to Crime Stoppers and you could earn a cash reward of up to $1,000.