Philadelphia police have arrested a well-liked family man for the brutal murder of a young doctor. Police say Jason Smith was an exterminator on a service call who got into an argument with Melissa Ketunuti.  They say that argument ended in a gruesome murder.

Dr. Ketunuti was found in the basement of her home. She was strangled with a rope and had her hands and feet bound behind her. Her body was set on fire.

For more on this story watch Jane Velez-Mitchell weeknights at 7 p.m. ET on HLN.