This past Monday, the New York Jets announced that Casey Johnson – the daughter of the team`s owner, Woody Johnson – passed away in Los Angeles. The cause of death is yet undetermined. Casey was just 30 years old when she died.

"The Johnson family is mourning its tragic loss, and asks for privacy during this very difficult time," a statement from the New York Jets said.

Police officers found Johnson in her Los Angeles home around 11:51 a.m. Paramedics pronounced her dead on the scene, officer Sara Faden said. Faden said she did not know how long Johnson may have been dead for by the time authorities arrived.

She said Johnson's death may have been from natural causes, since a preliminary death investigation didn't turn up any signs of foul play. A final cause of death will be determined by coroner's officials, but the results of the tests could take six weeks.

Casey`s great-great-grandfather (yeah, he`s really great) was the co-founder of Johnson and Johnson. Much like other popular modern heiresses like Paris Hilton, Johnson had a very outgoing personality, and was featured in the 2002 documentary The It Girls.

Last month, Johnson made headlines after she and reality star Tila Tequila announced that they were engaged. Casey even went as far as buying an engagement ring for Tila.

Tila Twitted about her loss: "I'm still in shock! Once again thank U for the outpour of love and support. I just wish to have some privacy at this heartbreaking time," and "# R.I.P my Angel. @caseyjonsonJnJ u will forever be in my heart! I love u so so much and we will Marry when I see U in Heaven my Wifey."

Johnson leaves behind a young daughter, Ava-Monroe, who she adopted from Kazakhstan in 2007.