You can order a copy of Adolphus Heermann's death record by printing and mailing the following form;http://www.sos.la.gov/Portals/0/archives/forms/LFP3LH8Public...
The cost is $5. Hopefully you will find information on his parents and his spouse and cause of death.
Just fill in the information requested;
Adolphus Lenis (Lewis) Heermann
D. 27 Sep 1865 @ 43 years of age
New Orleans, Louisiana