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From the Webster OnLine Dictionary; Homicide rules out any chance of suicide or accident according to the universally accepted definition. LE said it was a homicide, not that there was enough evidence gathered to justify a homicide.
Main Entry: ho·mi·cide
Pronunciation: \ˈhä-mə-ˌsīd, ˈhō-\
Function: noun
Etymology: in sense 1, from Middle English, from Anglo-French, from Latin homicida, from *advertiser censored* human being + -cida -cide; in sense 2, from Middle English, from Anglo-French, from Latin homicidium, from *advertiser censored* + -cidium -cide
Date: 14th century
1 : a person who kills another
2 : a killing of one human being by another
http://www.merriam-webster.com/dictionary/homicide
The ruling means only that there is enough evidence to justify a homicide investigation. Do you have a link to any LE representative saying that the incident itself was definitely a homicide?