12-21-12 -- Monserrate Shirley, Mark Leonard and Robert Leonard are arrested on 48 charges, including murder and arson, in the Nov. 10 explosion in the Richmond Hill neighborhood that killed two neighbors and damaged or destroyed dozens of homes.
The explosion ravaged a neighborhood on Indianapolis' south side.
Jennifer and John Dion Longworth died in the explosion.
Monserrate Shirley and Mark Leonard said in an interview with RTV6 five days after the explosion that they had no idea how it happened.
Marion County Prosecutor Terry Curry and others provided details of the arrests at a news conference.
Investigators said a regulator was taken out of the gas line into the home and that the source of the blast was a microwave oven.
Mark Leonard has a criminal background.
Bob Leonard also has a criminal record.
Mark Leonard had several profiles on online dating websites.
He called himself "TheTroubador" on Plentyoffish.com
Plentyoffish.com is one of several sites that he had profiles on.
Here's Leonard's datehookup.com profile. Several women say he befriended them, asked for loans and didn't repay them.
The explosion caused extensive damage in Richmond Hill.