Credit: Michael Kovac/FilmMagic; Jeffrey Mayer/

Two days after the shocking death of heiress Casey Johnson at age 30, her purported fiancee Tila Tequila had a standoff Wednesday with the LAPD, Nicky Hilton and Bijou Phillips at Johnson's L.A. home, and TMZ reported. Behind the scuffle? The late Johnson's elderly poodle, Zoey.

Radar reports that Hilton and Phillips, both friends of Johnson's, arrived at Johnson's home Wednesday to fetch Zoey for a sad errand: to put him in to sleep in order to be buried with her owner. The dog, a source claims to Radar, "is in very bad health. Casey would want the dog buried with her."

But Tila, attached to Zoey herself, "called 911 on the pair claiming they were trying to break into the property."

It was later reported that Hilton and Phillips departed with the dog, along some of Johnson's personal belongings and Tila "stood screaming," Radar says.

The daughter of New York Jets owner Woody Johnson and heiress to the Johnson & Johnson fortune, the hard-partying Casey was found dead around 11:51 a.m. in her L.A. home Monday. Her final cause of death -- no foul play is suspected -- will be deferred following toxicology tests.

Johnson had been friends since childhood with fellow heiresses Nicky and Paris Hilton. Nicky is godmother to Johnson's adopted daughter Ava, 3.

Tila Tequila announced their engagement in early December. The grieving reality star (real name Tila Nguyen) wrote on Twitter Tuesday, "I can't stop these haunting visions of her and I...We made such a lovely couple, only beginning to spend the rest of our lives together..."