11:45 AM PST -- Corey Feldman wrote on Twitter he's "very sad" about McCarter's death.
Brooke McCarter, who played Paul in "The Lost Boys," has died after a long-term illness.
The 52-year-old McCarter passed away Tuesday ... the result of complications from a genetic liver condition.
McCarter's acting career didn't take off after 'Lost Boys.' He made a name for himself as a regular at Horror Conventions around the country.