Private First Class Joseph Scott Pemberton appeared in court dressed in a black suit and dark tie for the start of the trial, five months after he allegedly murdered Jennifer Laude in a red-light district hotel.
Prosecutor Emilie Fe de los Santos told reporters that Pemberton's lawyers had made an offer to settle the case, but no agreement was reached by today so the trial began.
De los Santos gave no details about the plea bargain offer.
"No amount of money could pay for the years I spent raising my child," Julita Cabillan, mother of Jennifer Laude, told reporters.
Also Read
"What they did to my child was gruesome. Just because we are poor doesn't mean we can't fight for justice."
Pemberton, aged 19 at the time of the killing, would face 40 years in jail if found guilty of murder.
The maximum penalty for homicide in the Philippines is 20 years in jail.
Laude, also known as Jeffrey, was found naked with strangle marks on her neck in a cheap motel room at Olongapo city's red light district in October last year, according to a police autopsy report.
Pemberton, who had just finished training exercises between US and Philippine marines near Olongapo, checked into the motel with Laude, aged 26, shortly after meeting her at a bar, prosecutors said.
The prosecution's first witness, a bellboy, testified today that he saw Pemberton at the motel on the night Laude was killed.
She said that, although Laude's family rejected the plea bargain offer, it could be revived and introduced "anytime" during the trial.
But lawyers for Laude's family accused de los Santos of promoting the plea bargain, and separately filed a request with the justice department today asking for her to be replaced.