LOS ANGELES — Gene Wilder, the frizzy-haired actor who brought his deft comedic touch to such unforgettable roles as the neurotic accountant in “The Producers” and the deranged animator of “Young Frankenstein,” has died. Mr. Wilder’s nephew said Monday that the actor and writer died late Sunday at his home in Stamford, Conn., from complications from Alzheimer’s disease. Jordan Walker-Pearlman said in a statement that Mr.