Dear Mr. President. They killed my son. He was 24 years old. He was a Marine sergeant," Henryka Pietrzak-Varga begins her letter to President-elect Barack Obama, in which she talks about a brutal murder of her son Jan Pawel and his wife Quiana-Jenkins in their California home.

Ms. Pietrzak wrote the letter on Veterans Day. The letter was first published in Dziennik Wschodni, a Polish newspaper. She asks Obama for help in solving the investigation in the murder case of her son and a daughter-in-law.

Jan was born in Poland and had lived in the United States since he was 11. Until he enlisted for service at the age of 17, he spent his teenage years in the Bensonhurst section of Brooklyn. When he was murdered he was only 24. As a Marine he served in Iraq and later in Camp Pendleton in California, where he was a helicopter mechanic.

He married Quiana Jenkins on August 8th, and both were slain by fellow marines on October 15th. "They were attacked in their own home. They were first tied and knotted then subjected to inhumane tortures. My son's wife was raped in a bestial way, most likely in front of his eyes. They were killed in cold blood execution style," Ms. Pietrzak-Varga writes in her letter to Barack Obama.

According to the investigators, the Pietrzaks were killed by four fellow marines from the same Miramar Marine Corps Air Station in San Diego. Two of them served under Jan Pietrzak. All four were charged with murder and rape. The police are also checking whether one of the accused Marines, Lance Cpl. Tyrone Miller, has ties to the violent Crips gang.

Officially the investigators say that it was a robbery. None of the victims' families believes that. Some sources maintain that it was a revenge crime, while others stipulate it was racially motivated. All accused are black, just like Quiana Jenkins-Pietrzak. The fact that a white sergeant married a black woman and was making a career could have bothered the black men reporting to him.

At one of the press interviews, Ms. Pietrzak-Varga said she always prepared herself for the possibility of her son dying in Iraq, but it never crossed her mind that he could die in the hands of his fellow marines.

In the letter to Barack Obama she writes: "Dying on a battlefield from the enemy's bullet is honorable for the soldier and helps the family in their bereavement. Being killed in his own country by a fellow soldier takes away trust in the military service. For the family it is a source of eternal grief. My grief will never go away."