The Miami Herald obtained a DHS study of crime by immigrants convicted and not deported -- it concluded that at least 121 homicides “could have been avoided” between 2010 and 2014
".... comprehensive information from the Department of Homeland Security (DHS) about the number of immigrant convicts in the United States, their whereabouts, whether immigration authorities have succeeded in deporting them and whether they committed additional crimes after being released.
A committee letter sent to the Department of Justice and the Departments of State and Homeland Security nearly two years ago said that at least 121 homicides “could have been avoided” between 2010 and 2014 had Immigration and Customs Enforcement (ICE), under the prior Obama administration, deported immigrant convicts instead of releasing them.
“This disturbing fact follows ICE’s admission that, of the 36,007 criminal aliens it released from ICE custody in Fiscal Year 2013, 1,000 have been re-convicted of additional crimes in the short time since their release,” according to the letter, dated June 12, 2015.
http://www.miamiherald.com/news/local/immigration/article131227599.html#storylink=cpy