DOVER, N.H. – A man accused of beating to death his girlfriend’s daughter had beaten the toddler repeatedly for three months, court documents allege.

Chad E. Evans, 29, of Rochester, threw 21-month-old Kassidy Bortner against walls and broke her leg and arm in separate incidents this summer and fall, according to indictments in Stafford County Superior Court.

Evans is charged with second-degree murder for allegedly inflicting the blows to the head and abdomen that led to Kassidy’s death on Nov. 9.

Evans was living with Kassidy’s 18-year-old mother, Amanda Bortner, at the time. He also faces one charge of assaulting the mother.

Evans also is accused of preventing Kassidy from getting treatment for the injuries he had caused.

“Evans bruised Kassidy’s body and fractured her bones by repeatedly grabbing Kassidy by the face, throat, arms and legs” and by “propelling Kassidy into the walls of the home,” the court documents charge.

The indictments say Evans showed “extreme indifference to the value of human life.”

A grand jury also indicted Evans on two counts of first-degree assault and six counts of second-degree assault. All are felonies. If convicted of second-degree murder, Evans could face life in prison.

Evans, whose $100,000 bail was posted anonymously last month, is scheduled to be arraigned Jan. 3.

The indictments allege that Evans repeatedly assaulted Kassidy from about Aug. 1 until her death.

Amanda Bortner had to work on Nov. 9, so she dropped Kassidy off at the home of Kassidy’s aunt, Jennifer Conley, in Kittery, Maine. About four hours later, Conley’s boyfriend, Jeffrey Marshall, called Kittery police to tell them Kassidy was unresponsive, according to authorities.

She was rushed to York Hospital in York, Maine, where she was pronounced dead about 1 p.m.

After a weeklong investigation by New Hampshire and Maine state police and Kittery and Rochester police, Evans was arrested at his home and charged with manslaughter. The charge was later raised to second-degree murder.

Evans spent several days in jail before being released on bail.

State social workers in New Hampshire say they are involved in the investigation of Kassidy’s death. Citing confidentiality rules, the Division for Children, Youth and Families has not said whether it had any contact with the girl or her family before her death.