The lawsuit claims he stole over $20,000 in wages from employees at his Manhattan architecture firm, where he also allegedly made taunting phone calls to victims families.
Dennis Rader, the notorious serial killer known as BTK, has had his former home in Park City, Kansas searched by investigators hoping to tie him to more unsolved cold case murders.
The case is expected to be expensive and legally complex, experts say, with a thorough defense investigation needed to test and rebut the prosecution's evidence.