Leonard gave his commitment to the Tigers in November and recently informed ESPNHS.
The junior chose Towson over Michigan, Navy, High Point and Lehigh.
Churchill has played five games thus far this season and Leonard has tallied 20 goals and five assists.
E-mail lacrosse editor Mike Loveday at Michael.Loveday@espn.com with commitments. Please include any information you would like included in the story, including other schools considered and post season honors. Follow ESPNHS Lacrosse on Twitter @ESPNMike.