See if you local library has subscription websites for Newspapers like Heritage Quest or NewsBank. Mine has NewsBank and I was able to register at the library to access the website at home for free.
You may not be able to find it on-line. You may have to go to the library and dig it up.
People ask that question about 8 times a week here. The resolved questions are full of links and tips.
You are rare and special, but your question isn't. Here is my copy and paste answer.
When someone famous dies, there will be obituaries all over the Internet.
Looking for an ordinary person on the other hand, is searching for a needle in a haystack. It is like fly fishing, too; you have to cast a number of times and you still may not find anything.
It may be in
The newspaper that ran it may have it in their archives. Usually they keep it for 7, 30 or 90 days, though.
If the person died in Preble County, Ohio, prior to 1950, the county library web site may have it. By extension, the county library site for the county in question should be one of the "pools" you cast into. So should the US Gen Web site for the county, the Ancestry query board for the county and the GenForum board for the county.
If you live in the county, you can sometimes find the obit in the microfilmed newspapers. Sometimes there wasn't one, especially if the person died in a drug deal or the family was poor and the newspaper charged for obits. Big city newspapers don't print obits for everyone because they'd run out of space.
If you don't live in the county, you can send the library a name, date, SASE and $5 and request a copy. They will either try for it or return your check.
has two ways you can sometimes find a volunteer willing to look it up for you, with links and etiquette.
Sometimes you can find the obit in Google with an exact search. Try all forms of the name, enclosing it in quotation marks:
"Thomas A Edison"
"Thomas Alva Edison"
"Edison, Thomas A"
"Edison, Thomas Alva"
The case isn't important, nor do you need the commas. You and I know that "Thomas Alva Edison" and "Edison, Thomas Alva" are the same person, but a computer doesn't. You do have to use quotes ("), not apostrophes ('). Add "Obituary" and other words as needed outside of the quotation marks if you get too many hits for the name alone.
"Tom Edison" obituary
"Edison, Tom" obituary
"Thomas Edison" obituary