Jackson's former wife, Lisa Marie Presley, said she was "shocked and saddened" by Jackson's death.
But "we don't have control over the secondary market, " points out company spokeswoman Lisa Marie Bongiovanni.
Lisa Marie Turner, 33, of no fixed address, pleaded guilty to murder in October.
Lisa Marie Presley, who was married to Jackson from May 1994 until January 1996, is on the witness list.
Six-year-old Lisa Marie Bonham went missing while visiting relatives in Reno in 1977.
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Jackson's ex-wife, Lisa Marie Presley, said in an online blog posted Friday that she was not surprised by Thursday's news.
Simpson verdict, or Michael Jackson kissing Lisa Marie at the MTV awards.
Two marriages -- to Deborah Rowe, his dermatologist's assistant, and Lisa Marie Presley, daughter of the late Elvis Presley -- ended in divorce.
Then came the shocking, albeit relatively short-lived, marriage to Lisa Marie Presley -- a move that set off a whole new round of speculations.
Then in September, his wife Lisa Marie was arrested on suspicion of driving her Mercedes Benz in the Hamptons under the influence of alcohol.
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Despite his categorical denials of any wrong-doing, there was a media frenzy, heightened by Jackson's 1994 marriage to Lisa Marie Presley, Elvis' daughter, which some claimed was a publicity stunt.
CKX, the New York-based entertainment company, which two years ago bought a controlling stake in Elvis Presley Enterprises (EPE) from the late entertainer's daughter Lisa Marie, is taking to hotels and casinos to jump-start the estate's annual revenues.
"It was an unusual relationship yes, where two unusual people who did not live or know a 'normal life' found a connection, " Lisa Marie Presley, Jackson's ex-wife and the daughter of Elvis Presley, wrote Friday on her blog.
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