Closing arguments have begun at the trial of Brooke Astor's son, after four months of testimony featuring 74 witnesses.
Anthony Marshall and his lawyer are charged with taking advantage of the elderly Astor, in an effort to gain control of her massive fortune.
Astor, who died in 2007, left most of her $198 million estate to Marshall in a will that was revised in 2002.
Prosecutors say Marshall took advantage of Astor's deteriorating mental condition to change the will and take property and investments.
Defense attorneys argue Astor was competent and intended for her son to inherit her fortune.