On 29 August 1915, the Baltimore Sun published a story:
GIRL STABBED IN STORE
Katherine Kopp Runs 5 Blocks To Doctor’s With Knittng Needle In Thigh.
Katherine Kopp, 12 years old, 30 North Durham street, was stabbed twice with a 6-inch knitting needle, while she and two other little girls were in a store on Broadway about 6:30 last night.
A man, of whom the girl and her companions gave a good description, brushed them at the time the stabbing was done and he is believed to have thrust the needle into the girl. He hurried away immediately afterward.
The girl was wounded in the shoulder and in the thigh, the thigh being pierced an inch and a half. The frightened girl ran five blocks from the store to the drug store of Dr. Joseph S. Sandler, Baltimore and Ann streets. Dr. Sandler extracted the needle and applied an antiseptic.
Little Katherine and her companion, [sic] Carrie Lightner, 12 years old, 7 North Durham street, and Helen Flagle, 11 years old, 18 North Wolfe street, were in the store looking over the counters, when Katherine whispered to the other two.
“Somebody stuck me in the shoulder!”
A man had just passed them and edged off. The three girls watched him, but as he kept on they turned back to the counters, Within three minutes the man crowded past the three again and Katherine cried out:
“Oh, he stuck me again!”
The man left the store in a hurry. The three-inch shank of the needle was protrudng from the girl’s skirt. Little Helen seized it to withdraw it, but the other girl screamed in agony and ran from the store to Dr. Sandler’s. The needle point had bent in the girl’s flesh, and the druggist had difficulty in extracting it.
[The Baltimore Sun, 29 August 1915, page 14.]

1920 U.S. Census, Baltimore City, Maryland
6th Ward, Enumeration District 64, Sheet 15B
17 Durham Street
Dwelling 216, Family 217
Kopp, Margaret, head, owns free of mortgage, female, white, 35, single, can read and write, born in Maryland, both parents born in Germany and spoke German, speaks English, no occupation
Kopp, Katherine, daughter, female, white, 16, single, not in school, can read and write, born in Maryland, both parents born in Maryland, speaks English, filer for telegraph company, wage worker
Kopp, Milton, son, male, white, 5, single, not in school, can read and write, born in Maryland, both parents born in Maryland, no occupation
Rumbel, George, father, male, white, 73, widowed, year of immigration 1870, naturalized in 1876, born in Germany, native language German, both parents born in Germany and spoke German, speaks English, watchman for packing house, wage worker
Rumbel, Frank, brother, male, white, 29, single, can read and write, born in Maryland, both parents born in Germany and spoke German, speaks English, driver of paint wagon, wage worker

On 8 November 1924 in Alexandria, Virginia, Harry Cohen was married to Katherine E. Kopp. He was 23, born in Russia, parents Morris and Ida. She was 21, born in Baltimore, Maryland, parents William and Margaret. [Virginia, Bureau of Vital Statistics, County Marriage Registers 1853–1935.]

1930 U.S. Census, Baltimore City, Maryland
6th Ward, Tract 10, Block 95, Enumeration District 4-70, Supervisor’s District 4, Sheet 1A
133 Bradford Street
Dwelling 3, Household 3
Cohen, Harry, head, owner, $2,000 in real estate, owns radio set, not on farm, male, white, age 27, married, not in school, can read and write, born in Russia, both parents born in Russia, native language Yiddish, immigrated in 1906, not naturalized, speaks English, occupation clerical worker for postal telegraph, wage worker, at work previous day
Cohen, Catherine, wife, female, white, age 24, married, not in school, can read and write, born in Maryland, both parents born in Maryland, no occupation
Cohen, Carroll R., son, male, white, age 3-6/12, single, not in school, born in Maryland, father born in Russia, mother born in Maryland, no occupation
Cohen, Irene M., daughter, female, white, age 6/12, single, not in school, born in Maryland, father born in Russia, mother born in Maryland, no occupation
Household 4
Kopp, Margaret, mother, female, white, age 45, unclear mark as to marital status, not in school, can read and write, born in Maryland, both parents born in Germany, speaks English, no occupation
Kopp, Milton C., brother, male, white, age 15, single, in school, can read and write, born in Maryland, both parents born in Maryland, speaks English, occupation messenger for postal telegraph, wage worker, at work previous day
Kopp, LeRoy E., brother, male, white, age 5, single, not in school, born in Maryland, both parents born in Maryland, no occupation

1940 U.S. Census, Baltimore City, Maryland
6th Ward, Enumeration District 4-100, Sheet 3B
133 Bradford Street, visited number 64, home owned, home value $1,250
Cohen, Katherine E., head, female, white, 36, married, not in school, highest grade attained 8, born in Maryland, living in same place in 1935, at private work, hours worked 40, telephone operator for postal telegraph, private work, weeks worked 52, income 769, has other income
Cohen, Carroll I., son, male, white, 14, single, in school, highest grade attained 5, born in Maryland, living in same place in 1935, not at work, no other income
Cohen, Irene M., daughter, female, white, 10, single, in school, highest grade attained 3, born in Maryland, living in same place in 1935
Kopp, Margaret, mother, female, white, 55, divorced, not in school, highest grade attained 4, born in Maryland, living in same place in 1935, engaged in housework, no other income
Kopp, Leroy, brother, male, white, 15, single, not in school, highest grade attained 4, born in Maryland, living in same place in 1935, not at work, no other income

A death notice stated:
COHEN
On October 5, 1985 KATHERINE E. (Nee. Kopp), beloved wife of the late Harry Cohen, devoted mother of Carroll I. Cohen, and Irene M. Cohen. Also survived by six grandchildren and two great grandchildren.
Funeral services will be held at the Duda-Ruck Funeral Home of Dundalk Inc., 7922 Wise Avenue, on Wednesday at 11 A.M. Interment Meadowridge Memorial Park. Friends may call Monday and Tuesday 3 to 5 and 7 to 9 P.M.
[The Baltimore Sun, 7 October 1985, page 4D.]