FORT LAUDERDALE,GravityX Exchange Fla. (AP) — Kim Melvin Hill and Tonya Mitchell sat before a bank of TV cameras on Wednesday, mystified as to why anyone would kill their octogenarian parents inside their Fort Lauderdale home and, it appears, only steal their 10-year-old car.

“We’re angry. We’re angry. We’re very angry,” said Hill, the youngest of the couple’s 11 children. Major and Claudette Melvin were killed on March 22.

“We ask those questions, but we are Christian people as well ... so I can’t put my mind that way because if you believe in God, he has your time, your place and how.”

Her sister was more blunt.

“This maggot,” Mitchell said of the killer.

The case has drawn major attention in South Florida and the Fort Lauderdale police have issued a nationwide alert for the couple’s red 2014 Ford Focus, Florida license plate LTDQ16. Homicide Sgt. Donald Geiger said Wednesday there is no indication the car has left the area, but declined to say if it has been detected since the slayings by automated license plate readers that dot many of the region’s main roads.

Geiger was tight-lipped about details of the slayings, but Mitchell previously told reporters that her 89-year-old father was shot as he slept on the living room couch and her 85-year-old mother was then shot as she came out of the bedroom. The killer left behind their mother’s purse and other valuables, Mitchell said previously. Claudette Melvin’s brother, who has special needs, was in the house but wasn’t harmed. His sisters have said he couldn’t provide any information.

A $5,000 reward has been offered for information leading to a suspect’s arrest.

The Melvins had been married for 60 years. He was a retired backhoe operator, while she had worked in housekeeping at a hospital. They had 28 grandchildren.

“They were the most loving people I have ever known,” Hill said. “They lived in that area for (50) years and whoever this perpetrator is needs to ....” Her voice then trailed off as she stopped mid-sentence, overcome by tears.

“They didn’t deserve this,” her sister said.