Englewood City, Precinct 20 April 21, 1930 ED 3-15, Sheet 2A
Knull, Jacob R., head, 30, married at 24, b. IN, parents OH, occupation radio service man, radio service store Irma H. wife, 29, m. 24, b. IN, parents IN James Richard, son, 5, b. CO Betty Irene, daughter, 2 9/12, b. CO
Unfortunately I couldn't find an obituary in the online databases of the Denver Post and Rocky Mt. News.