A lengthy investigation by the Fayette County Sheriff's Office into the triple murder-suicide involving Chris Benoit has concluded that the professional wrestler killed his wife and 7-year-old son, and that he acted alone.

Tuesday morning's announcement came after "a careful examination of all evidence" collected by authorities since the bodies of Benoit, his wife Nancy and Daniel, their 7-year-old son, were found inside their Fayetteville home in late June.

AP (ENLARGE)

In 2004, World Wrestling Entertainment's World Heavyweight Champion Chris Benoit kisses his wife Nancy at Edmonton City Hall Thursday after a ceremony honoring Benoit.

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Authorities had cited evidence that had originally pointed to Benoit as his family's killer before he decided to take his own life.

The sheriff's department said further investigation supported those initial indications. The department said it "found no evidence that indicates the presence of any other individual or individuals who contributed to the deaths of the three members of the Benoit family."

Benoit, a former World Wrestling Entertainment star, was found to have abnormally high levels of testosterone in his body at the time of his death, said Dr. Kris Sperry, Georgia's top medical examiner.

Sperry, however, added there was no direct link between Benoit's steroid use and the violence that claimed his life and that of his family.

The estates of both Chris Benoit and Nancy Benoit are considering wrongful death lawsuits against the WWE.