A shaken Mary-Kate Olsen has stepped up security after receiving hate mail and death threats from angry fans of Heath Ledger. According to a recently published report, many fans of the late Oscar-nominated actor blame pint-sized Mary-Kate for the drug overdose that led to his death in January.

“A lot of people who knew Heath and Mary-Kate in his last months know that they were partying together constantly, it wasn’t hard to connect the dots and run a line between Heath hooking up with Mary-Kate and his sad decline,” a celebrity mole reveals in a new tabloid report.

“One crazed fan sent her threatening letters. Another made menacing phone calls,” according to a friend of the actress. “Mary-Kate’s gotten more reclusive, paranoid and afraid to walk the streets than ever.”

Tags: Mary Kate Olsen