| Source: Annual Report of the Board of Police Commissioners of the City of St. Louis, 1872-1945 (incomplete run) Location: St.L. / 352.2 / Sa2 | |
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| Last Name: | O'Brien |
| First Name: | Martin |
| Middle Name: | F. |
| Title: | Jr. |
| Age: | 26 |
| Remarks: | in list of probationary patrolmen appointed; in list of resignations of officers; in list of officers reinstated |
| Report: | 62nd Annual Report, Year Ending March 31, 1923 |
| Page: | 9, 13, 17 |
