After Frederick Denkmann died he was buried in a mausoleum in Rock Island’s Chippiannock Cemetery.
 On April 5, 1976 the cemetery superintendent Joseph Vogele discovered that the mausoleum had been broken into and a stained glass window by Louis Comfort Tiffany was stolen.
  The thieves were never caught, but the window was located in Jamaica, New York in the 1990s.
 It was eventually returned to the Denkmann family in 1997 and a Tiffany glass conservator was hired to repair a couple of cracks in the window in 1999.
 It is now on permanent loan to the Figge Art Museum in Davenport.
After Frederick Denkmann died he was buried in a mausoleum in Rock Island’s Chippiannock Cemetery.  On April 5, 1976 the cemetery superintendent Joseph Vogele discovered that the mausoleum had been broken into and a stained glass window by Louis Comfort Tiffany was stolen.   The thieves were never caught, but the window was located in Jamaica, New York in the 1990s.  It was eventually returned to the Denkmann family in 1997 and a Tiffany glass conservator was hired to repair a couple of cracks in the window in 1999.  It is now on permanent loan to the Figge Art Museum in Davenport.
Frederick Denkmann