A businessman whose mother and three wives died under suspicious circumstances will spend his life in prison after being convicted of murdering his third wife by cocaine poisoning.

Lowell Amos, 54, said Roberta Mowery Amos, 37, died accidentally during sex play in which he inserted cocaine into her body. Her body was found in a Detroit hotel room in 1994.An autopsy determined that her body contained 15 times the amount of cocaine needed to kill a person. Amos, a former General Motors plant manager from Anderson, Ind., faces a mandatory sentence of life in prison without parole when he is sentenced Nov. 4.

Roberta Amos' parents said Thursday's guilty verdict, which carries an automatic sentence of life without parole, will help them put their lives back together.

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"I think all the wives will rest better tonight," said her mother, Marie Wagner.

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