Kaichen 's former landlord , Carol Halperin of Chappaqua , said Kaichen told her she volunteered at Ground Zero after the attack .
Kaichen 's former landlord , Carol Halperin of Chappaqua , said Kaichen claimed to have volunteered at Ground Zero in the aftermath of the attack .
Before Sunday , 19 firefighters assigned to wildfires had died on duty this year , according to Tracey Powers of the National Interagency Fire Center in Boise .