The plane went down in a field near the intersection of Highway 123 and Farm road 81.
John Lambert, 44, of Springfield, his children Grayson Lambert, 16, McKinley Lambert, 15, and Joshua Lambert, 10, along with family friend Robin Melton, 46, of Ozark, were on board when the single engine plane went down.
A friend of the Lambert family says the group was flying back from a Kansas City Royals game.
The plane may have been en route to the Springfield-Branson National Airport, about five miles from the crash site.
The investigation is ongoing and has being handled by the FAA and National Transportation Safety Board.
According to the Associated Press, Lambert owned Missouri Insulation & Supply Inc., while Melton owned an environmental consulting firm called Environmental Works Inc.
Friends and family members have set up a memorial page on Facebook (https://www.facebook.com/RipGraysonLambert) and are encouraging people to wear orange today to remember the Lamberts and Melton.
Five People Killed in Small Plane Crash Near Willard