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Feedback by radio-loud active galactic nuclei (AGN) in galaxy groups is notfully understood. Open questions include the duty cycle of the AGN, the spatialextent of the radio lobes, the effect they have on the intragroup medium, andthe fate of the cosmic rays. We present the discovery of a 650 kpc-radio galaxyembedded in steep diffuse emission at $z = 0.18793 \pm 5 \times 10^{-5}$located at the center of the galaxy group MaxBCG J199.31832+51.72503 using anobservation from the LOFAR Two-meter Sky Survey (LoTSS) at the centralfrequency of 144 MHz. Subsequently, we performed a GMRT observation at thecentral frequency of 607 MHz to study the spectral properties of the source.The observations reveal a radio galaxy with a total radio power $P_{\rm tot,1.4} \sim 2.1 \times 10^{24}$ W Hz$^{-1}$, exhibiting two asymmetrical jets andlobes. The derived spectral index map shows a steepening toward the innerregions and a steep-spectrum core region. We model the integrated radiospectrum, providing two possible interpretations: the radio source is evolvedbut still active or it is just at the end of its active phase. Finally, in thesame field of view we have discovered Mpc-sized emission surrounding a closepair of AGN located at a redshift $z = 0.0587 \pm 2 \times 10^{-4}$ (SDSSJ131544.56+521213.2 and SDSS J131543.99+521055.7) which could be a radioremnant source.

Studying the late evolution of a radio-loud AGN in a galaxy group with LOFAR