Andrea Constand walks to the courtroom during Bill Cosby's sexual assault trial at the Montgomery County Courthouse in Norristown, Pa., Tuesday, June 6, 2017. Cosby is accused of drugging and sexually assaulting Constand at his home outside Philadelphia in 2004. (AP Photo/Matt Rourke, Pool)

Andrea Constand walks to the courtroom during Bill Cosby's sexual assault trial at the Montgomery County Courthouse in Norristown, Pa., Tuesday, June 6, 2017. Cosby is accused of drugging and sexually assaulting Constand at his home outside Philadelphia in 2004. (AP Photo/Matt Rourke, Pool)

NORRISTOWN, Pa. (AP) — Bill Cosby’s chief accuser took the stand at his sexual assault trial Tuesday to tell her story publicly for the first time, saying the comedian violated her after giving her three blue pills that left her paralyzed and helpless.

“In my head, I was trying to get my hands to move or my legs to move, but I was frozen,” Andrea Constand, a 44-year-old former employee of the basketball program at Temple University, said in their long-awaited courtroom confrontation. “I wasn’t able to fight in any way.”

She added: “I wanted it to stop.”

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Cosby, 79, is charged with drugging and sexually abusing Constand at his suburban Philadelphia home in 2004. The TV star once dubbed America’s Dad could get 10 years in prison if convicted.

His lawyers tried to poke holes in Constand’s story, citing differences between her courtroom testimony and the accounts she gave to police and in a lawsuit in 2005. The defense has argued the two had a romantic relationship, that Constand wasn’t incapacitated and that the sexual encounter was consensual.

Constand, an athletic 6-footer with dark curly hair, was calm and collected as she testified, looking at the jury as she began describing the assault.

She said Cosby gave her pills he claimed were a natural remedy to ease her stress about a looming career change. “They’re your friends. They’ll take the edge off,” she quoted him as saying.

She told the jury she started feeling woozy after about 20 minutes, with blurred vision, slurred words and legs that felt like rubber. Cosby then penetrated her with his hand and also placed her hand on his penis and moved it back and forth, she said.

She said she was unable to push him away or tell him to stop.

Afterward, Constand said, “I felt really humiliated and I felt really confused.”

Cosby, sitting across the room at the defense table, leaned in to listen, whispered to his lawyer and, at times, shook his head.

Before Tuesday, Constand had never spoken about Cosby in public, barred from doing so under the terms of a confidential settlement they reached in 2006. Her deposition from that lawsuit remains sealed.

Some 60 women have come forward to say Cosby sexually violated them, all but destroying his nice-guy image, but the statute of limitations for prosecution had run out in nearly every case. Constand’s case is the only one in which Cosby has been charged.

Constand, who is from the Toronto area, met Cosby while working for the women’s basketball team at Temple, Cosby’s alma mater. She said they became friends over conversations about the team and later her career. He invited her to dine with him at his home.

Cosby was “somebody I trusted,” Constand said. “A mentor.”

But he had also previously made advances on her, she said. One time, he placed a hand on her thigh. Another time, she said, Cosby tried to undo her pants but took his hand away when she leaned forward and told him: “I’m not here for that. I don’t want that.”

Asked by a prosecutor why she remained friends with him, she said: “I wasn’t scared of someone making an advance at me or a pass at me.”

The defense has pointed out that phone records show Constand called Cosby 53 times after she says he assaulted her. Constand told the jury the calls mostly involved the women’s basketball team, especially around tournament time.

“It had more to do with business than it did with me personally,” she said.

Constand also said she went to a performance of Cosby’s later that year with her family in Canada after Cosby arranged to drop off tickets. She felt “terrible” about it, she said, especially when her mother brought Cosby some Canadian souvenirs.

“It was a very big burden on me, but ... I did not have the courage at the time to tell my family,” she said. “So I just went along with them.”

During cross-examination, defense lawyers seized on what they said were inconsistencies in Constand’s accounts, including her answers on how long she had known Cosby and whether she had ever been alone with him before. Cosby lawyer Angela Agrusa also pressed Constand on why she stayed in contact with Cosby afterward.

Constand’s cross-examination will continue when court resumes Wednesday.

The stage was set for her testimony after prosecutors used the first day and a half of the trial to argue that Cosby made a habit of knocking women out with pills and then molesting them.

Kelly Johnson testified on Day 1 that Cosby drugged and molested her at a Los Angeles hotel bungalow in 1996. She said she lost consciousness soon after Cosby pressured her to take a large white pill. She said that when she awoke, her breast was exposed, and a naked Cosby forced her to sexually gratify him with her hand.

On Tuesday, Johnson’s mother, Pattrice Sewell, bolstered her daughter’s story. She told jurors that Johnson was distraught during a telephone call in 1996, fearing Cosby was trying to get her fired from her job working for the comedian’s agent.

A few weeks later, Sewell said, Johnson disclosed that she had woken up next to Cosby in bed with her clothes askew.

Sewell said they didn’t go to police at the time because her husband, a Los Angeles detective, feared the ordeal that would ensue.

“Her father didn’t want her to be humiliated and feel shame and embarrassment as he had seen other women go through when they went to the police at that time. He didn’t want that,” Sewell said.

Johnson told a similar story about Cosby in 1996, when she gave sworn testimony as part of a workers’ compensation claim, lawyer Joseph Miller testified Tuesday.

She claimed to have developed debilitating stress from her secretarial job at the William Morris Agency and eventually settled for around $10,000, according to Miller, who represented the talent agency in the case.

But Miller’s account differed from Johnson’s in at least one respect: Under questioning from Cosby’s lawyers, Miller said his notes show Johnson told him the encounter with Cosby happened in 1990, not 1996.

The Associated Press does not typically identify people who say they are sexual assault victims unless they grant permission, which Constand and Johnson have done.

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For more on Cosby, including trial updates, historical photos, videos and an audio series exploring the case, visit: http://www.apnews.com/tag/CosbyonTrial