Arizona

The Latest: Former firefighter alibi to testify against him

FILE - This April 26, 2015 file photo provided by the Pima County Sheriff's Department shows, David Dwayne Watson, in Tucson, Ariz. The criminal case against the former Tucson Fire Department Capt., Watson, who built his career while he was a murder suspect in the cold case killings of his ex-wife, her mother and her mother's friend, begins with opening statements in Tucson on Wednesday, Oct. 5, 2016.  (Pima County Sheriff's Department via AP, File)

FILE - This April 26, 2015 file photo provided by the Pima County Sheriff's Department shows, David Dwayne Watson, in Tucson, Ariz. The criminal case against the former Tucson Fire Department Capt., Watson, who built his career while he was a murder suspect in the cold case killings of his ex-wife, her mother and her mother's friend, begins with opening statements in Tucson on Wednesday, Oct. 5, 2016. (Pima County Sheriff's Department via AP, File)  (The Associated Press)

The Latest on the murder trial against a former Arizona firefighter charged with killing his wife, mother-in-law and her friend. (all times local):

12 p.m. A prosecutor says the one-time alibi of a former Arizona fire captain charged with killing his ex-wife and three years later gunning down her mother and her mother's friend will testify that she lied on his behalf.

Jonathan Mosher said during opening statements that David Watson's second ex-wife, Rosemary Watson, went to police years after the murders and said she had covered for her then-husband. Rosemary and David Watson were married after he was divorced from Linda Watson, whom he is charged with killing and burying in the desert.

Mosher says there is plenty of evidence to prove Watson, a former Tucson Fire Department captain, killed Linda Watson to keep full custody of their young daughter and later killed Linda Watson's mom, Marilyn Cox, to keep her from having unsupervised visits with the girl.

Rosemary Watson is set to testify on Wednesday afternoon.

The defense hasn't delivered opening statements yet.

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10 p.m. Tuesday

Attorneys are set to deliver opening statements Wednesday in the trial of a former Arizona fire captain who rose through the ranks while police worked to solve three cold-case killings he is now charged with committing.

David Watson is charged with killing his ex-wife, Linda Watson, in August 2000 during a custody battle over their only child and disposing of her body in the desert. Her remains were found in 2003 in an area where migrant bodies have been found in the past and were not identified until 2011.

Three years after his wife was reported missing, Watson and his former mother-in-law, Marilyn Cox, were embroiled in a legal battle over the couple's daughter.

Police say he gunned down Cox, 63, and her friend Renee Farnsworth, 53, after they returned from a court-mandated visit with the young girl on May 7, 2003.