A woman accused of stabbing her husband's lover 17 times has told a court she had no memory of the attack.
Mrs Foster is accused of stabbing Julie Simpson 17 times
Alethea Foster, 61, told jurors at Cambridge Crown Court she was "sorry" for what happened.
She said she had planned to kill herself in Julie Simpson's room at Cambridge University after discovering Miss Simpson's affair with her husband.
But prosecutor Karim Khalil QC told Mrs Foster on Tuesday that "not remembering is not a defence."
Miss Simpson, a 45-year-old mature student from Beckenham, south London, was stabbed in the hall of her Cambridge college in October 2005.
Mrs Foster, a retired foot specialist who has been married to her husband John, a former BBC journalist, for 35 years, told the court she was glad Miss Simpson was not dead.
"When I saw Julie on the first day that she gave evidence it was such a relief to me to see her standing there," she said.
In her final statement to the jury, Mrs Foster said: "I am so sorry for what happened. I am so sorry for her (Julie Simpson) and I am so sorry for John."
The court has heard Miss Simpson was blinded in one eye in the attack.
Mrs Foster denies attempted murder and causing grievous bodily harm with intent.
The trial continues.