Dot.Kill (2005)

Old-fashioned NYPD detective Charlie Daines, a grave long cancer sufferer, feels out of his depth when as serial killer posts his gruesomely imaginative murders, mostly on top managers, on Internet, first spotted by his couch-potato son Vinnie. The brass rather confides the high-profile case to 'nerds', champion of whom is wheelchair-stuck Adam Sotrel. Charlie systematically alienates everybody, family and colleagues, but finds an angle to approach the case.