A man is in custody Friday on suspicion of strangling his girlfriend at a Golden Hill-area home, where her young children were present, police said.Officers went to an apartment in the 2800 block of A Street in response to a domestic disturbance call received around 11:15 p.m. Thursday, said San Diego police Officer David Stafford.The officers found the woman, identified as 31-year-old Christina Jones, badly injured in her bedroom. She later died at a hospital, according to police. Jones' boyfriend, 29-year-old Melvin Carter, was arrested and booked into county jail on suspicion of murder, Stafford said.Jones' two young children -- ages 4 months and 17 months -- were taken into protective custody, according to police. In addition to the children, a relative of the woman's, possibly a cousin, was present in the home and made an emergency call after seeing Carter threatening Jones with a knife and a frying pan, authorities said.The man had just been bailed out of jail by his mother after an earlier domestic dispute with Jones. The victim had obtained papers to request a restraining order against the man but had not turned them in before she was murdered, the victim's sister told 10News' Rachel Bianco Friday morning. The sister had urged the victim to file the papers for weeks, she told 10News.