As per this site, Kulasekara Azhwar indicates the incident of Shri Rama killing Shambuka in verse 749 in the 10th dashakam of Perumal Tirumozhi of the Muthalayiram of the Nalayira Divya Prabandham. The relevant verse is:
செறிதவச் சம்புகன் தன்னைச் சென்று கொன்று செழுமறையோன் உயிர் மீட்டுத் தவத்தோன் ஈந்த
ceṟitavac campukaṉ taṉṉaic ceṉṟu koṉṟu ceḻumaṟaiyōṉ uyir mīṭṭut tavattōṉ īntaMy sweet Lord Rama went and slew Shambuka of terrible penance, gave life to the dead Vedic seer. Note 2
One can listen to the above verse of the Perumal Tirumozhi at 50:23 onwards in this video
Questions:
- Does the Sri Vaishnava tradition (scriptures and commentaries, not necessarily on Valmiki Ramayana) record the incident in detail and if yes, are there any variations from the Ramayana and Puranas, (where Shambuka is killed merely because he was a shudra ascetic/ wanted to attain heaven with his mortal body); for example was he an asura and not Shudra human? Note 1
- What is the Sri Vaishnava justification/ view with regard to this incident, irrespective of any variation from the Ramayana and Puranas? (Also in case there is no variation how is the killing explained/justified just because he was merely a Shudra)
Notes:
- Had read on a Tamil site which I can’t find that Shambuka was actually an asura named Jambuka (both written as cambuka in Tamil) and not a human Shudra (the upside down penance can give a clue as to this fact). His being an asura and a Brahmin dying makes more sense.
- Translation from here
- I don’t understand Tamil