Comic Title: Detective Comics #501
Publisher: DC (DC Comics Inc.)
Address: 75 Rockefeller Plaza, New York, NY
Cover Date: April 1981
On Sale Date: January 22, 1981 Newsstand Date January 22, 1981
Source: Comic Reader, #187

Newsstand Date January 22, 1981
Source: DC Coming Attractions, #50

Copyright Date January 22, 1981
Source: Library of Congress, Copyright Office 1981

Newsstand Date January 22, 1981
Source: Daily Planet, Vol. 81 #1
Listed as on sale the week of January 22nd

Shipping Date December 30, 1980
Source: DC Coming Attractions, #50

Frequency: Monthly
Cover Price: $0.50
Page Count: 32
Editor: Paul Levitz

Title: "The Man Who Killed Mlle. Marie"
Pages: 17

Feature(s):
Batman (of Earth-1)

Writer: Gerry Conway
Penciller: Don Newton
Inker: Dan Adkins
Letterer: Ben Oda
Colorist: Adrienne Roy

Reprinted In:
Tales of the Batman:Gerry Conway Vol. 1 HC (2017)
Batman Allies:Alfred Pennyworth TPB (2020)

Feature Character(s)

• Batman (last appearance in Brave & the Bold #174; next appearance in Detective Comics #502)

Supporting Character(s)

• Alfred Pennyworth (last appearance in Brave & the Bold #173; next appearance in Detective Comics #502)
• Lucius Fox (last appearance in Detective Comics #500; next appearance in Detective Comics #502)

Guest Appearance(s)

• Mademoiselle Marie (last appearance in Unknown Soldier #249; next appearance in Detective Comics #502)