Bizarre interrogation video of a US woman accused of stabbing her boyfriend 27 times in one of the US's most high profile murder trials has been released.
Jodi Arias, charged with the 2008 murder of her Mormon boyfriend Travis Alexander, is shown smiling, laughing and singing to herself after her police interrogators leave the room, Fox News reports.
At one stage Arias can be seen doing a handstand against the wall, and later picks up the bin to rifle through its contents.
She can also be heard muttering to herself that she wished she was wearing make-up.
Just 15 minutes before her behaviour took a strange turn, Arias can be seen breaking down in tears as she pleads with police to tell her how many times her boyfriend was stabbed.
She was charged with the brutal murder later the same day.
The video adds a new twist to a trial that has gripped the nation for its gruesome details and revelations of illicit sex between the outwardly religious couple.
Arias has been tried by a 12-person jury for the past six months.
Although she initially denied involvement Arias later admitted she had stabbed her boyfriend and spiritual mentor 27 times, shot him in the head and slit his throat in self-defence.
US news reports have particularly seized on the line "it may change my memory" that Arias can be heard singing in the interrogation video, noting her persistent lack of memory of the events surrounding her boyfriend's death.
A psychologist who testified in the case diagnosed Arias with post-traumatic stress and said it was normal for people involved in similar events to lost their memory.
"A large percentage of individuals who are in such settings do not remember or have cloudy or foggy memories of what has transpired," Richard Samuels told the court.
"We are more concerned with survival."
Arias's defence lawyers have told the court she suffered an abusive childhood and cheating boyfriends.
She claims Alexander sexually abused her and choked her to the point of unconsciousness.