NEW YORK — “ER” actress Mary Mara, who police say died in a possible drowning in upstate New York, may have suffered a head injury before her death, a representative for the star said. She may have sustained the injury in a slip and fall, the representative told TMZ, citing what investigators told the actress’ family. Mara, 61, was found dead in St. Lawrence River at Cape Vincent on Sunday, New York State Police said. “The preliminary investigation suggests the victim drowned while swimming,” police said in an announcement Monday. “The victim’s body showed no signs of foul play and was transpo…
