TUCSON — A former Tucson Fire Department captain convicted of killing his ex-wife and two others has been denied another trial and was sentenced to 66 years in prison on Monday.

David Watson was found guilty in March of the separate killings of ex-wife Linda Watson, her mother and her mother’s friend.

Watson was arrested more than a decade after the killings.

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Prosecutors said Watson killed his ex-wife during a bitter custody battle in 2000. Linda Watson’s remains were found in 2003 but weren’t identified until several years later.

They also said David Watson gunned down his former mother-in-law, Marilyn Cox, and her friend, Renee Farnsworth, in 2003 while the two were embroiled in a legal battle over visitation rights with Cox’s granddaughter.

Watson maintains his innocence. He was a longtime firefighter and captain who resigned shortly after his arrest.

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