RICHMOND, Va. -

Federal, state and local law enforcement are hoping to crack open a 30-year-old unsolved murder case involving a Virginia state trooper.

Johnny Rush Bowman was repeatedly stabbed when he answered his front door on Aug. 19, 1984. He lived in the Bristoe Station development of Manassas.

Bowman’s wife was there during the attack and called 9-1-1. The attacker(s) fled on foot, leaving behind eyeglasses, a wig and a construction hard hat.

Bowman, 31, died at a local hospital. In addition to his wife, Bowman left behind a 2-year-old daughter.

The forensic evidence from the case was retested in the 1990s and in 2010. The last testing gave investigators more information.

In August 2012, the FBI, Virginia State Police and Manassas City Police Department announced a $50,000 reward for information leading to the arrest and conviction of the individual or individuals responsible for Bowman's murder.

Law enforcement agencies are asking anyone with information to contact the Virginia State Police tip line at 703-803-2637 or email their information to bci-fairfax@vsp.virginia.gov.

Information can also be reported to the Manassas City Police Department Investigative Services Division at 703-257-8092 or Crime Solvers. The Manassas City Crime Solvers will pay a cash reward up to $1,000 for information that leads to an arrest in these cases. The confidential 24-hour tip line is 703-330-0330.

The FBI can be contacted at 1-800-CALL-FBI (1800-225-5324).