Police say the three people responsible for the deadly southside explosion had tried unsuccessfully to blow up the home a week earlier.
The Marion County Prosecutor’s Office charged Monserrate Shirley, 47, Mark Leonard, 43, and Bob Leonard, 54, with two counts of murder, conspiracy to commit arson, 12 counts of Class A felony arson and 33 counts of Class B felony arson each.
Investigators believe they removed a natural gas valve on the fireplace, let gas build up in the home for six to nine hours and ignited it with a spark from a microwave that could be set on a timer, Marion County Prosecutor Terry Curry said.
Shirley and Mark Leonard lived in the home on Fieldfare Way that exploded but weren’t home at the time.
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