Casey Anthony's father, George Anthony, revealed Tuesday that he attempted suicide to be reunited with his dead granddaughter Caylee, and damaged his daughter's defense by pointing out that she was the last one to see the toddler alive, ABC News reported.

A tearful George Anthony told jurors he still battles with suicidal thoughts and that on Jan. 22, 2009, he took a mixture of medications and beer to try to end his life.

My emotional state even through today is very hard to accept that I don't have a granddaughter any more. But for that particular day [Jan. 22, 2009] ... it just felt like the right time to go and be with Caylee, he said.

George Anthony also described writing an eight-page suicide note.

I wrote this specific letter to my wife Cindy to tell her how I felt and how I didn't want to be in this world anymore, he said.  At another point, when the jury was out of the room, George Anthony said, I needed to be with Caylee. I believed I had failed her.

Six weeks before his suicide attempt, the remains of his granddaughter were found in a wooded area near the Anthony family home, finally proving for him that Caylee was murdered.

Casey Anthony is accused of murdering the 2-year-old and could face the death penalty if convicted. She has pleaded not guilty.

The defense claims Caylee accidentally drowned in the family pool in the summer of 2008 and George Anthony helped dispose of the body. The defense also alleges that he sexually abused Casey Anthony and that she hid her daughter's death like she hid the alleged abuse.

George Anthony denied those claims, as well.