Brooks, the son of Oscar-winning composer Joseph Brooks
, was convicted
of Cachay's murder in July.
Her partially clothed body was found in an overflowing bathtub on December 9, 2010, The AP
reports. She was 33-years-old.
Right after her murder, Cachay's parents said breaking up
with Nick may have resulted in her death.
Prosecutors say he strangled her after she attempted to end their tumultuous relationship.
Nicholas Brooks' attorney says Sylvie Cachay drowned accidentally due to a mix of alcohol and prescription drugs.