STOCKTON, Nov. 15 — Stockton police, investigating the murder of Lauren Chavelle Willett, 19, said they are pressing their efforts to determine if the aliases used by two of the suspects represent the names of real people.

But Detective Capt. Delbert Milligan said his men have been unable as yet to find out anything about the names Gordon Foote or Karen McCartney.

Foote was the name used by Michael Lee Monfort, 24, and Karen McCartney is the name given to Stockton police by Nancy Laura Pitman, 24, when the two were arrested along with three other persons for the murder of Mrs. Willett.

Arrested along with Monfort and Miss Pitman at 720 W. Flora St. were James “Spider” Craig, 33; Priscilla K. Cooper, 21, and Lynnette Alice Fromme, 24.

All three of the women have been linked to the Charles Manson clan. Miss Fromme was among those testifying at the cult leader’s trial for the murders of actress Sharon Tate and others, and she and Miss Pitman were among those identified as having camped outside the Los Angeles courthouse during the Manson trial.

Craig and Monfort identified themselves to local police as members of the Aryan Brotherhood, an organization of convicts and ex-convicts which authorities say is dedicated to racism and involved in illegal activities.

Monfort, Craig and William Goucher, 23, also have been charged with the murder of Mrs. Willett’s husband, James T. Willett, 26, of Los Angeles. His body was dug up last week from a redwood grove near Guerneville, Sonoma County. Authorities said he had been shot to death about Oct. 10.

Mrs. Willett’s body was found buried beneath the West Flora Street home rented by the group early Sunday after police found a shovel and freshly turned earth under the house.

Officers had gone to the home on a tip in search of Monfort, who failed to appear for a court hearing on a robbery charge. The charge involved the holdup Oct. 30 of a north Stockton liquor store. Both he and Goucher were arrested after the robbery. Goucher stayed in jail and Monfort posted bail of $10,000 but failed to appear in court Nov. 3.

Besides trying to find out whether the aliases used by Monfort and Miss Pitman represent the names of real people, police are checking into two shotguns and a .38 caliber pistol found in the rented home to determine whether they are stolen. But Milligan said the check so far has drawn a blank.

When police went to the home on West Flora Street Saturday night they found Miss Pitman holding a baby, since tentatively identified as the child of Mrs. Willett. Miss Pitman said the mother had gone to Kentucky to be with the baby’s father, Jim Willett.

The baby has been identified tentatively as Heidi Willett, the 8-month-old daughter of the Willetts. The child has been placed in Mary Graham Hall, a county facility.

Police generally are tight-lipped about the case, with one officer indicating there is the danger of jeopardizing the case, Milligan, however, said it appears that Mrs. Willett “was not coerced into coming to Stockton with the suspects or staying with them.”

Sonoma County Dist. Atty. John Hawkes has been quoted as saying it is believed Willett was killed because “the others were afraid he’d tell about robberies the three male suspects allegedly committed in the Los Angeles area.”

He said Willett “didn’t seem to have been involved in the crimes of the other three but he knew about them.”

The Sonoma County official said Willett and his wife shared a two-bedroom resort cabin with the three men last month in Guerneville.

Investigators theorize that the victim’s wife had traveled with the group since then without knowledge of her husband’s death.

Then, when a hiker discovered Willett’s body, they think Mrs. Willett was killed to keep her from telling police what she knew.

Milligan said most of the suspects can be placed in Stockton as of Oct. 30, but people living in the neighborhood where the killing took place said two or more of the suspects may have lived there for at least a month.

Miss Pitman told officers Mrs. Willett was shot while Monfort was toying with a gun. She said the group first planned to take her to a hospital but when it became obvious the woman, who was shot in the head, was dead, they decided to bury her instead.