George Anthony, father of Casey Anthony who has been charged with killing her 2-year old daughter Caylee, took the witness stand on Friday, saying he smelled strong odor in his daughter Casey' car.

Casey Anthony, 25, is charged with killing her daughter Caylee, who was only 2 years old. The trial will continue 6 to 8 weeks in Florida.

According to experts, evidence in Anthony's car will be crucial for this homicide case. Tests tied the odor to chloroform and human decomposition. A strand of Caylee's hair was also found in the car.

George Anthony recalled the situation, saying he and his wife had gone to retrieve the Pontiac Sunfire Casey had abandoned. He said a pretty strong odor diffusing from the car. As a former police officer, George discerned it's the smell of a decomposing human body.

He said, That particular smell whenever you smell it, it's something that you never forget. It's a very distinct odor. But when he opened the trunk, he didn’t find corpse, only trash. He testified the odor is so strong that it’s impossible to drive the car. When he parked the car in the garage, he let all the windows open. And he also found a stain on the spare tire cover, which he never saw before.

On that day - 15 July 2008 - Cindy Anthony, Casey’s mother reported the to the police that Caylee was missing. She also told the 911 dispatcher about the odor in Casey's car, which smelled like the dead body.

Simon Birch, the supervisor of Johnsons Wrecker Service, which removed Casey's abandoned Pontiac Sunfire, also gave testimony. He said he also detected an odor in the car that smelled as if there was a dead body in it.

I put my hand up to the glass to shield the sun and look through the windows. At that point, I did notice a fairly strong odor emanating from the vehicle, Birch said. The instant flash in my mind was, whoah, I know what that smells like.

Birch is a 30 year veteran of the towing industry, who said he can distinguish the difference between dead body smell and garbage smell.

Birch said, the smell came out very instantly … very potent. It was eye opening…. In the back of my mind, I said to myself that' s the smell of decomposition. At that time, George Anthony was also present.

On June 27, 2008, Anthony's abandoned car was found by Katherine Sanchez, an employee of Amscot, a financial services company. She also smelled odor in the car. She said there was a blanket in the car. Actually, when Caylee's remains were found, it was wrapped in a Winnie the Pooh blanket and stuffed in plastic bags.

On Friday morning, Casey's future sister-in-law testified that the relationship between Casey and her daughter was special.

Defense attorney Jose Baez tried to call for a mistrial but was refused.