Casey Johnson

Casey Johnson's fiancee Tila Tequila tells "Extra" she will seek custody of Johnson's adopted daughter Ava.

Johnson's mother has custody of Ava and Tequila says that's not what Casey wanted.

"Her last wish was to have Ava, have me have Ava," she revealed. The former reality TV star says she will file papers to adopt.

Tequila was also not given the details of Johnson's funeral and was unable to see the heiress before she was buried.

"She's not resting in peace right now. She has come to me in my dreams," Tila explains.

Johnson, 30, died Jan. 4 and the cause of death has not been determined, but Tequila knows she would not purposefully take her own life. Tequila confesses, "I know for a fact, because Casey was so excited for our life together, I know for a fact it was not suicide."

She continued, "I know it was an accident because she did have a sleeping problem." Johnson suffered from diabetes and Tequila said she did not have trouble managing her disease.

Tune in to Wednesday's show for more of "Extra's" interview with Tila Tequila.

Click below for photos of Tila from over the years:

Heiress Casey Johnson has been laid to rest at her family's estate in New Jersey.

"Today was just a private, open-casket funeral for immediate family," a source tells Us Weekly. A larger memorial for friends is reportedly scheduled in the next few days.

According to People magazine, Nicky Hilton, Casey's longtime friend and godmother of her daughter Ava, attended the quiet service.

Over the weekend, Johnson's reported fiancée Tila Tequila complained about being left out of memorial plans, saying, "I don't want to talk about the funeral. I wasn't allowed to go, and I am so upset. I can't sleep, and I am on suicide watch."

Johnson's pals have dissed the "Shot at Love" star for seeking attention from the media about Casey's death.

Johnson was found dead in a Los Angeles home on January 4. The cause of death has yet to be determined.

Tila Tequila was not invited to the funeral of her reported fiancee Casey Johnson -- and she isn't happy about it.

See photos of Tila from over the years

A source close to Tequila tells UsMagazine.com, "She wants so badly to go to the funeral, but nobody will give her the details or tell her anything. She is extremely frustrated, as what she shared with Casey was real and special. Nobody understood."

Over the weekend Tila, 28, told E! News, "I don't want to talk about the funeral. I wasn't allowed to go, and I am so upset. I can't sleep, and I am on suicide watch."

It seems the reality TV star has been seeking media attention via Twitter and photographers since the death of Johnson on Jan. 4.

An unidentified woman placed a 911 call when she found Casey Johnson's "cold" body in her guesthouse.

"She's ice cold and her hands are turning blue," the woman told the dispatcher. "I have two other people with me and we all think she's dead."

When asked if she thought it was suicide, the woman replied "I don't know," and added, "Very often, her medications get all screwed up. It's probably because of that."

Johnson, an heiress to the Johnson & Johnson fortune, died on Jan. 4. She was 30.

Casey Johnson's death at 30 was untimely, but it didn't come as a shock to people in her inner circle.

"She had so many ups and downs, but lately, it wasn't very good," a friend of Casey's tells People magazine. "She tried rehab, wanted things to change... but it didn't stick."

The pal says that Johnson's increasingly bizarre behavior continued up until her death. "Just a few months ago, she was living like a crazy person," the source says. "Super erratic behavior. People could barely be around her."

The source says the Johnson family was estranged from Casey and had cut her money supply in hopes that she would turn her life around. "Her family couldn't handle her behavior and lack of respect, so they cut her off," the pal says. "They thought it would teach her to turn things around."

Paris Hilton and Nicole Richie, childhood pals of Johnson, reunited at the L.A. home of Nicky Hilton last night to mourn Casey's death.

See what Paris said about Casey's death

Casey was reportedly engaged to reality star Tila Tequila when she died, and a close pal of Johnson, English model Jasmine Lennard, slams the "Shot at Love" star for enabling Casey's downward spiral.

Lennard tells Radar Online, "Casey's family tried desperately to help her... when it came out that Casey had been arrested, she had nobody and was lost. Tila got a hold of her and said, 'Hey, come out with me and we'll show them!' For her to die with this reputation, it's just not her. Tila is a sick, sick girl."

Johnson's autopsy was completed yesterday, but results of toxicology tests could take weeks.

Paris Hilton is mourning the loss of her "longtime friend" and fellow heiress, Casey Johnson.

See how Paris has changed over the years

"I feel so sad right now, my heart is in pain," Paris writes on her Twitter page after learning of Casey's death. "Just lost a longtime friend. My heart goes out to her family. R.I.P. Casey Johnson Love you :("

The Johnson family has been friends with the Hilton family since before Paris and Casey were born. Paris' sister Nicky is godmother to Casey's daughter Ava, 3.

Hilton continues, "In bed crying, looking at baby pictures of Casey, Nicky and I. I feel so upset. I feel like I've lost a sister. My heart is broken. Miss her."

See the most shocking moments of 2009

Johnson was originally asked by Hilton to co-star in the reality series, "The Simple Life." Johnson turned it down, so the role went to Paris' other pal, Nicole Richie. In 2006, Casey told Vanity Fair that her decision to pass on the role was "the stupidest mistake of my life". She added, "I kick myself in the butt every day."

Paris concludes her Twitter posts with, "God has another Angel by his side. Casey, we all Love and Miss you and know that you are in a better place. R.I.P."