John Rizzo, who currently holds the seat in the 19th Legislative District, is a candidate [pdf] (among others) for the open seat in 11th Senate District. The race for 19th Legislative District seat is now an open one. Ingrid Burnett (D) has a committee and is raising money:

C161001: Ingrid Burnett For Missouri

Committee Type: Candidate
3418 Gladstone Blvd Party Affiliation: Democrat
Kansas City Mo 64123 Established Date: 01/07/2016

Candidate Treasurer [….]
Ingrid Burnett John Burnett

Election History Election Year Primary Outcome General Outcome Political Office
2016 State Representative District 19

[emphasis added]

Today at the Missouri Ethics Commission:

C161001 01/22/2016 INGRID BURNETT FOR MISSOURI John Burnett 3418 Gladstone Blvd Kansas City MO 64123 Burnett Law Offices Attorney 1/22/2016 $5,200.00

[emphasis added]