Watch: Coverage of memorial for former First Lady Barbara Bush

Remains of missing Hollywood actress believed to have been found in shallow grave

LOS ANGELES -- The remains of an actress missing for more than a month were believed to have been found in a shallow grave in Northern California, the Los Angeles Police Department said Tuesday.

Adea Shabani is seen in a photo released by LAPD.

Officials also confirmed they think 33-year-old Christopher Spotz -- a man who they say was involved in an intimate relationship and possibly her boyfriend -- was somehow involved in the missing woman's death, Capt. William Hayes said.

Police had called him a "person of interest."

During a police chase Thursday, however, Spotz shot and killed himself, according to authorities.

Despite what a friend told KTLA earlier, authorities have not positively identified the remains as Adea Shabani's. A cause of death was also under investigation, though police said they suspect she was the victim of a homicide.

The news comes after officials said Tuesday that detectives had responded to Nevada County to investigate a suspected shallow grave amid their search for the missing woman.

The gravesite was found on the banks of Dry Creek in the Spencerville Wildlife Area, in an area about 50 miles north of Sacramento, according to a statement from the Nevada County Sheriff's Office.

Los Angeles police had contacted the office Monday to notify sheriff's officials that they were working an active missing persons case in the area.

Detectives and anthropologists from Cal State Chico responded to the scene, where they worked to determine if there were human remains buried at the location and whether they were tied to an active missing persons case, the statement said.

Earlier, a source close to the investigation told KTXL in Sacramento that remains were found at the location, and were possibly those of the aspiring actress who vanished last month under suspicious circumstances.

Adea Shabani, 25, is seen in a photo shared by her family on March 1, 2018.

Adea Shabani, 25, is seen in a photo shared by her family on March 1, 2018.

Shabani, an acting student who moved to Los Angeles from Macedonia, was last seen near her Hollywood apartment on Feb. 23, according to police.

Surveillance video showed Shabani and Spotz in an elevator in her apartment.

Concerned friends reported her missing after she failed to show up for an important acting class and stopped responding to calls or text messages.

Her mother flew out from Macedonia as friends canvassed the area in a frantic and desperate search.

Authorities say Spotz took his own life after a lengthy police chase involving a Toyota Tacoma, authorities said.

Shabani was apparently last seen in the Tacoma, police spokeswoman Rosario Herrera told the Los Angeles Times.

The California Highway Patrol said the pursuit suspect was possibly tied to a homicide in Los Angeles County, but did not elaborate on the case.

Spotz attended the same acting school as the missing woman, friends said.

Spotz told police he was traveling to Northern California with Shabani when the two had an argument in Santa Clarita and he let her out of the vehicle, Hayes said.

The captain said Spotz had at one point retained an attorney and that the investigation into Shabani's disappearance also took them to homes in Northern California and Colorado where Spotz has family.

Investigators had previously searched the Lake of the Woods wildlife area in Nicolaus, California, to no avail before they found the remains in Nevada County, Hayes explained.

A friend of Spotz who spoke with KTLA on Monday night, said he was unaware of a romantic relationship between Spotz and Shabani, and was under the impression Spotz had a fiancee who lived outside the city.

The friend, who asked not to be identified, also went to the Stella Adler Academy of Acting.

"When I first heard that he had possibly been the one to have done this, I was just like, 'This is not the Chris I know,'" the man said.

He described Spotz as "funny, could be the life of the party if he needed to be, or could be in the back if he needed to be. He was whatever you needed at that moment."

Police have not released a motive in the death.