Write SQL query to solve given problem: List the research assistants' full names, capabilities and GPAs who were under the supervision of Merwyn Conkay.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T3.f_name, T3.l_name, T2.capability, T3.gpa FROM prof AS T1 INNER JOIN RA AS T2 ON T1.prof_id = T2.prof_id INNER JOIN student AS T3 ON T2.student_id = T3.student_id WHERE T1.first_name = 'Merwyn' AND T1.last_name = 'Conkay'