15. Who may be joined as parties defendant

15. The plaintiff may, at his option, join as parties to the same action all or any of the persons severally, or jointly and severally, liable on any one contract, including parties to bills of exchange and promissory notes.

Under section 15 of the Civil Procedure Code, the executor of a deceased person who was a party to be joined with surviving party in an action by the holder of the note. 

Muttiah Chetty Vs. De Silva (2 N.L.R. 109)