The prison inmate who was allegedly murdered by "Austin Powers" actor Joe Son has been identified ... and authorities tell us he was a convicted child molester.
The victim has been identified as 50-year-old Thomas Graham (pictured above) -- who had once been convicted for committing lewd and lascivious acts on a child under the age of 14.
At the time he was killed, Graham was serving a two-year sentence in Wasco State Prison for failing to properly register as a sex offender.
As TMZ previously reported, cops believe Graham's cellmate Joe Son -- who played shoe-throwing villain Random Task in the original "Austin Powers" movie -- killed Graham in their cell on October 10.
Son is currently in solitary confinement while prison officials investigate.
Son is already serving a life sentence for torturing a woman back in 1990.
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