Lynch, 25, was fatally shot by a Virginia Beach police officer on the city's oceanfront on March 26.
The family is also seeking $350,000 in punitive damages against Solomon Simmons, whom the lawsuit identifies as the officer who shot Lynch in March.
"It is critical my family and the other victims' families get the transparency, honesty and justice they deserve," Williams wrote in a post paying tribute to his 25-year-old cousin.
The French duo emerged from the underground dance music scene to become canonical figures and, eventually, mainstream global stars with 2013's "Get Lucky."
Donald Trump's presidency and campaign has seen several musicians and bands declaring they do not want their music played at his events.
RTJ surprise released their latest album, which is loaded with lyrics that speak to the current moment.
A growing number of musicians don't want their work associated with the Donald Trump presidency.
The singer and producer joined Bernie Sanders at a rally in North Carolina.
Gaye family lawyer wants "an injunction prohibiting the further sale and distribution of 'Blurred Lines.'"
There are so many good reasons to hate "Blurred Lines," but plagiarism is not one of them.
Many of the businessmen and heads of state who attend the annual event prefer to travel in style.
The youths had filmed a singalong video to the Pharrell Williams Hit Single "Happy", in Tehran