By Debbie Emery - Breaking Celebrity News Reporter

Having tracked down the mother who had him adopted as a baby, Matthew Roberts was even more shocked when she told him that his father may be notorious cult leader Charles Manson, and now he is hoping a court-ordered DNA test will prove his paternity once and for all.

“We’ve been trying to do an DNA test, even though it is a federal offence to take DNA out of a prison, so now we are trying to get a court order,” Roberts told Breaking Celebrity News in an exclusive interview.

“We did it once before and it was inconclusive because the sample was tainted. We just did another test with an alleged grandson that came up negative, but it’s not known for certain if he is really related,” explained Roberts, who claims new genetic evidence is expected to reveal that MMA fighter Jay Freeman, whose nickname is Charles Manson III, is not the helter skelter killer’s real grandson.

As Breaking Celebrity News previously reported, 77-year-old Manson had his 12th parole application rejected earlier this month and he remains incarcerated at Corcoran State Prison in Central California.

Manson was originally sentenced to death for his part in the cult style murders by members of his commune, The Family, but it was modified in 1977 to life in prison with the possibility of parole.

As for 44-year-old Roberts, he has been writing to the man who may be his father for some time but the two have never met. “I have corresponded with him through the mail and have letters and cards from him,”