Gavin Smith Disappearance: 20th Century Fox movie executive missing since last Tuesday

(CBS) LOS ANGELES - Gavin Smith, a 20th Century Fox movie executive, has been missing since Tuesday, May 1, 2012. Although police say they do not suspect foul play, CBS Los Angeles reports that they are baffled by his disappearance

Smith, 57, who has been an executive in Fox's movie distribution division for more than 18 years, was last seen driving his black Mercedes 420E sedan Tuesday evening near his Oak Park home in the 500 block of Callwood Court.

He was supposed to pick up one of his sons on Wednesday morning but he never showed up. His sister, Tara Addeo, says this was very uncharacteristic: "He would not do this. We don't want to think the worst. We can't imagine he would just leave."

According to CBS Los Angeles, Smith's son, Evan Christian Smith tweeted Sunday "Still looking for him. I'll never stop."

He also tweeted, "If my faith hasn't crumbled nobody's should. #GodisGood."

Addeo, who flew in from Nevada this weekend, told the station that she spent six hours puttng up flyers all over Los Angeles Sunday. "We just want my brother back," she said. "We just want to see him again."

Smith is described as 6-feet-6 inches tall, about 210 pounds. He has a goatee, gray hair with blond highlights and green eyes. He is reportedly married and the father of three.

Authorities are asking for the public's help. They're asking anyone with information to call 800-222-TIPS (8477).