Horn was notable for pioneering many mixing techniques while at Motown, and for directly supervising most of the mixes for Motown singles during the label's success period from 1964 to 1967.
Laid off by Motown in 1990, Horn slid into debt. In 1993, Horn contracted James Perry to kill his ex-wife, mentally challenged son, and the family's overnight nurse in their Silver Spring, Maryland, home. The murders were carried out on March 3, 1993. The motive for hiring Perry to commit the murders was that Horn stood to gain $1.7 million from his son's trust fund that was established after the settlement of a lawsuit resulting from a medical procedure that left him a quadriplegic. Perry was sentenced to death in 1995 for the murders, and in 1996 Lawrence Horn was found guilty on three counts of first-degree murder and one count of murder conspiracy and sentenced to life imprisonment. The conviction of the assassin, Perry, was overturned by an appeals court and a second trial sentenced him to three life terms in Maryland's prison system in 2001. Perry died of an undisclosed illness while still in custody on December 30, 2009.
The case prompted a lawsuit against Paladin Press, the publishers of Hit Man, which James Perry used as a guide to execute the murders. The lawsuit was settled when the publishers agreed to stop selling the book and pay millions of dollars in compensation to the families of the victims.
- Vick, Karl (15 February 1998). "Horn Convicted for Three Murders". The Washington Post. Retrieved 17 October 2010.
- Duggan, Paul. "Crime Scene - Notorious Montgomery killer dies behind bars". The Washington Post. Retrieved 17 October 2010.
- "Horn gets life for ordering slayings of family, nurse". The Free Lance Star. May 18, 1996. Retrieved 17 October 2010.
- "Publisher's book aided in murders". The Deseret News. December 22, 1997. Retrieved 17 October 2010.
- "Publisher agrees to pull hit man manual". Reading Eagle. May 22, 1997. Retrieved 17 October 2010.
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