The private pathologist hired by Anna Nicole Smith to perform a second autopsy on her son said that Daniel Smith most likely died of cardiac arrhythmia.

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Dr. Cyril Wecht said the arrhythmia was caused by a combination of Lexapro, Zoloft and methadone, Us Weekly reported Thursday.

It is known that the Lexapro was prescribed to Daniel Smith but it is unknown where he got the other two.

Wecht also told Us Weekly that there is no doubt in his mind that this was an accidental death.

Methadone, Wecht said, is "a legitimate prescription drug for pain relief" and that Smith had "no known history of morphine addiction," reported People magazine.

Smith died in the Bahamas while visiting his mother in the hospital Sept. 10, three days after she gave birth to baby girl.