Thelma nearly drowned during the filming of 1932's Horse Feathers, when she fell out of a canoe being rowed by Groucho Marx. Groucho didn't know she couldn't swim, and crew members rescued her.
Stan Laurel greatly admired Thelma's work, and personally picked her as a leading lady in several of his films. They remained very close friends until her death.
Roland West, Thelma's boyfriend as the time of her death, confessed to closing the garage door while her car was running, thus poisoning her with carbon monoxide and killing her, on his deathbed in 1952. However, no legal action was ever taken against him. The LAPD initially ruled Thelma's death of carbon monoxide poisoning accidental. They claimed that she was only warming her car up and didn't realize the garage door was closed.
Thelma was comedian Charley Chase's favorite foil and leading lady. She appeared with him in 12 films between 1929 and 1932.
In the 1931 movie Monkey Business, Groucho Marx says to Thelma, "You're a woman who's been getting nothing but dirty breaks. Well, we can clean and tighten your brakes, but you'll have to stay in the garage all night". This line seems to predict her death of carbon monoxide poisoning in her garage just 4 years later.
Thelma made her film debut in 1926 with Fascinating Youth.
In addition to her screen career, Thelma also owned and operated a successful nightclub and restaurant called "Thelma Todd's Sidewalk Cafe".
Thelma was Miss Massachusetts of 1925.
Thelma was married to Pat DiCicco from 1932 until they divorced in 1934. They had no children.
Thelma has a Star on the Walk of Fame.
Thelma made 119 films in her career. 3 were released after her death.
Thelma was 5'4" tall.