"Riverdale" actor and convicted murderer Ryan Grantham is worried about his safety if he serves his sentence in a maximum-security prison, according to his lawyer, Chris Johnson. The 24-year-old Canadian was sentenced to life in prison with the possibility of parole in 14 years after he pled guilty to the second-degree murder of his mother Barbara Waite. Johnson told Fox News Digital Grantham could be at a higher risk of abuse in prison due to his "diminutive" stature and "young-looking" appearance.